Or a rear mounted Corvair H6 with Twin Turbos (or hot-rodded Porsche, or VW engine). That big V8 would need some room up front. With the engine out back behind the driver, the narrowing of body and frame wouldn't limit space as much as the space ahead of the firewall needed for an engine, especially a V8. If you had to keep the motive power out front, you'd have to look at an inline engine, 6 cyl or maybe 8 cyl...