i spose it's like anything, you can fit any motor that your heart desires, but they all have one thing in common- $$$$$$$$$$$$
i once saw a v8 in one but the fella was sitting in the back seat to drive it. the only suggestion i can give is pick a motor that you wont get bored with! and a motor that doesn't require huge amounts of cash flow. i once saw a 1200 coupe in fast fours with a 13b PP, tubbed full on drag car, he spent about $75 000($AUS) the question is-IS IT WORTH IT? depends on how stupid you go with it! let us know what you deicide and of any deveopments.