The RCAF may have been interested, but when Trudeau comes in, forget it.
As I have proven (and others would agree with) having him get his ass kicked in the early 1970s is fairly easy. The F-111 was a strike aircraft, however, and Canada's fighter fleet was at the time made up of the CF-104, CF-100, CF-101 and CF-116 (F-5). The F-5 was bought because it was cheap - the RCAF wanted the F-4 Phantom and fought like hell for them. Best bet here might be for GD to have Canuck F-111s made in Canada, and propose that the Canadians (which had a major unemployment in the problem in the early 1970s) build their F-111s and rebuild their F-4s in Canada. GD could even propose the F-111B (with the AWG-9/AIM-54 combo) for Canada's need for interceptors.
Best way to do this is to have the unification of the Canadian Forces not go well, causing a massive problem with morale across the forces. This becomes a major problems by 1970, to the point that Canada has a hard time meeting its NATO obligations. Trudeau is hounded by the NATO countries about this, but his preferred option of leaving NATO is not an option because of both political and diplomatic opposition. In the meantime, Rolls-Royce's 1969 bankruptcy sees Orenda finish the RR RB211 engine design and finish it, leading to the Rolls-Royce Orenda RB211 being used to power the Lockheed TriStar. Lockheed's financial problems are assisted by several Canadian aerospace firms, which in return makes for some L-1011s being made in Canada. The growing aerospace industry in Canada makes the obsolete RCAF fleet look worse still. The RCAF's plans for new aircraft are up, but the F-5 is declared completely unsuitable for the RCAF and as such never enters service.
By 1971, Trudeau is losing points diplomatically and needs to do something. General Dynamics, with the F-111 running out of orders, goes for the long ball and offers the entire F-111B project to the RCAF, proposing that Canadair take over the F-111B project, and have the RCAF replace its fleet of CF-100 and CF-101 interceptors with the F-111B. This is an expensive option, but it is loudly picked up on by both the (anti-communist and pro-trade union) NDP and the (staunchly pro-military) Progressive Conservative party.
Trudeau loses his majority in 1972, and to keep NDP leader David Lewis happy (and get Robert Stanfield off his back), Trudeau takes over the GD proposal and quickly gets the F-111B program working under Canadair. The first Canadian F-111B flies for the first time in February 1974, and without the problems of carrier landings and a number of Canadian aerodynamic improvements, the CF-111B proves to be a capable unit. The AWG-9/AIM-54 combination is several orders of magnitude better than what it is replacing, and while the CF-111 loses out badly to the F-14 Tomcat in maneuverability, it is considerably longer-legged than the Tomcat and is able to do interceptor roles with ease. The project creates thousands of jobs and gives the Canadian aerospace industry a massive boost at a time when it needed it, and the Canadian Forces ultimately buys 136 examples of the CF-111B between 1974 and 1980. The original TF30 engines don't last long in the CF-111, with the improved CF-111C trading the TF30s for Orenda-built (and improved) versions of the Rolls Royce Spey turbofan, giving both greater power and slightly better fuel consumption.
The end of the Vietnam war sees mass numbers of F-4s left surplus, and covering the gap between the end of the obsolescent CF-100, CF-101 and CF-104 is done by a nearly 150 F-4E and F-4J Phantom IIs leased from the United States in 1972-73. Trudeau's loss in the 1974 Canadian election elevates Conservative leader Robert Stanfield to power. Stanfield's election platform on defense included the F-4s staying in Canadian service even as the CF-111 goes into full production. The United States is quite happy to go for this, and the 146 F-4 Phantoms are sold to Canada for peanuts in November 1974. All of these fly as-is for a while, but all eventually cycle through Canadair for RR-Orenda Spey engines and other improvements.
The Stanfield government's projects for Canada's aerospace industry revolve mostly around finishing the CF-111B and improving the RCAF's abilities in several other departments. The CF-100 was retired in 1970, the CF-101 in 1975 and CF-104 in 1977, as the CF-111B (given the name Chimera by the CF in 1978) and CF-144 Phantom entered service in large numbers. The first squadron of CF-111Bs is deployed to Europe in 1977, and the Canuck pilots prove to be amazingly good at what they do. Many of the improvements of Canadian CF-111s go to other nations as well, including the RR-Orenda engines.