Ive seen Rover V8s in them, but IMO you gotta be a goon for that, esp as theres ISNT much room in the enginebay at all really.

Plenty for a rotory, but the engines are about half a normal engines size.

If want an engine swap, put another Rotory in it, triple rotor 20B or if ya feeling mental a quad rotor 26B like the LeMans cars, n/a and 700+ bhp of the maddest sound you ever heard