I have a 90crx si with a b16a2 swap but the body is almost not worth repainring so i found a clean 88si shell. I know the front motor mount on the bottom has to be cut and a small indent on the wheel well has to be made for the alt to fit. But other than that can anyone think of what else might have to be done to drop it into an 88.

Thanks

 

see http://www.droppedcrxsi.com

From that donor car, you should have pretty much everything you need. Remember that the 1990 CRX and 1988 CRX wire harnesses are slightly different. Non-interchangeable.