Had the RB-106 been developed and met expected performance figures, it wouldn't change the configuration of the Lightning. Changing the Lightning configuration to one which keeps the performance, but allows the fitment of advanced avionics, a variety of weapons, and additional fuel, changes the very nature of the Lightning, making it not a Lightning. With twice the available power, the new Lightning could have used only one engine, for example, used fuselage space for fuel, revised the undercarriage and added weapons stations on a revised wing, but that isn't a Lightning. It might have been a success with foreign sales. But it wouldn't be the Lightning, which wasn't.What about my suggestion? The upgraded P.8 'Super Lightning' wouldn't have used Rolls-Royce Avon engines, but Rolls-Royce RB.106 engines instead- roughly the same size and weight as the Avon, but with twice the thrust output. It was good enough for the Canadians to select it as their engine of choice for the Avro Arrow- with those engines fitted into an improved EE Lightning, you'd have certainly had a world-beater. If it had been delivered before 1960 as planned, with Lockheed's bribes having either been exposed earlier on or having toned down to mitigate the risks of exposure, then this improved cutting-edge version of the English Electric Lightning would have had no trouble getting selected over the Lockheed F-104G Starfighter, Grumman F11F Super Tiger, and Northrop N-156.