You can retain A/C, although I do not have personal experience with anyone doing it. You will need motor mounts and axles from a 90-93 Integra and you will need to get the whole B16 swap because it includes the tranny and ECU which are necessary for the swap. I sold my B16A swap to a kid with a 90CRX DX and it only took him and a good friend of mine a few days to get it all wrapped up. Definately worth it that car walks me.