Well, first I'd like to put a 3.8 V6 Suoercharged engine-(The Bonnevile SSEI) into a 89 Pontiac Gran Prix SE. How much would something like that cost,(roughly), assuming I could get the engine and supercharger second hand?

Thats a very tough question to ask and very difficult to put a $ sign on. Are you sure that it will fit? Do you have to notch the frame? Are you doing it all yourself? It could end up costing a lot of money. Good luck

The classic first post/empty poll problem....

First do'nt use a poll for this type of question,now onto the swap yes it would be possible but there would be issues,first off you would want a motor and trans. for the swap cost around $1500-$2000 or maybe you could find a wrecked Bonny or GTP for the swap cheaper ,one of the bigger issues would be the wiring but engine fitment may be a problem,I would say nay to a swap like this for many reasons ,if you want a good swap try a Fiero a very light rear enginened car and the swap has bean done.Chico.