91 buick skylark engine and tranny question

I recently aquired a 91 buick skylark with a 2.5 4cyl engine and well it just dosent seem right to put a 4 cyl in this car to me i feel like it should have an 8 cyl and be rear wheel drive especially since i notice a big hump going along the center of the floor to the rear of the car where a drive shaft might go so i was figureing on putting in a 350 crate motor with a tranny to match and making it a rwd instead of a front wheel drive then i think the car will have the recognition it deserves the questions i have arent is it possible because anything is possible with the right amout of money and know-how but my questions are besides the engine tranny drive shaft rear differential and wiring harness what would i need and how easy would it be not that im scared of it being hard becuase i love doing things like this especially since ive never seen a skylark with a 350 in it. but yea any help would be appreciated. Thanks.