So I had a plan of buying a 2012 California Special next year but then the idea came to mind of restoring a '67-'70 Cougar(I love those cars) and swapping in a new 5.0L and 6 speed to save gas since iwould make it my summer daily driver. I plan on starting by buying the cougar this year and have it restored within a year to year and a half. Rebuild the engine and swap in a 6 speed from a cobra or gt500 then later get a new 5.0L crate engine or from a wrecked 2011+ GT. Has anyone in this forum done a 6 speed swap to their classic? Did it improve your gas mileage on your carburated motor?