How much would it cost to customize my Acura Integra?

I have recently bought a 1991 acura integra. it has a lot of things on it already, it has a body kit, costume paint, suicide doors, costume headlight and tail lights, racing seats, etc. there are a few things i want to change, the interior and the engine. I was told that the engine was rebuilt but it was done horribly so i want to get a 1st gen vtec B16A motor in it, and i want to give it a paint job and i want to put 17" rims, and change the interior. what i really want is a nice clean cut yet dependable car. is it a good idea or should i try to fix the rebuilt engine? and around how much would it cost.