Let me figure the math. Yep. 4 across, rear row fires first.
Pinetree radars were there, financed and manned by Americans.
I have no idea how Canada was roped into the nuclear strike role, because the Starfighters were replacing Canadair Sabres in the day fighter role, and the Starfighter's replacement was the CF-18 which wasn't configured for the strike role. It wouldn't seem to me to be a major problem to push it all the way out the door, but I don't rule Canada. The big part of the Starfighter program was industry off-sets, like Canadair building the bird and Orenda building the engines. That's a little harder to push back.
Earlier in the thread it was mentioned that the method of payment for the initial 66 Voodoos was the RCAF agreeing to operate Pine Tree radars. If the Arrow is built then the RCAF doesn't need the Voodoos and as a result doesn't need to man Pine Tree radars to pay for them. If the RCAF isn't operating them does the US still do it or does it all pretty much fall over in favour of the DEW line?
If the Arrow is built then the Canadair Industry offsets aren't needed, Canadair is fully occupied building Arrows. I imagine the Arrow would also replace the Sabre as a fighter, but what was the RCAF using as a fighter-bomber in the late 50s early 60s?