A friend out in California back in the late 1970's did Crown Corvair one better- - - -instead of a small block Chevy engine, he put a Chrysler 392 hemi in the back seat of a 66 Corvair coupe. He put the radiator in the trunk where the engine used to be, along with two big electric fans. He said it was "interesting" to drive, especially on some of the twisty roads in the Sierra Nevada mountains. The weight distribution was almost a perfect 50/50 front to rear, and it handled extremely well. The tread on the rear tires was 14 inches wide.
Jerry