http://www.redpepperracing.com/forum...rd.cgi?act=FAQ
Check this site out, they have tons of info for the 1st gen crx. The Si would be a good platform to start out with, since it is fuel injected and not carbeurated like the hf and dx models. This will make it a lot easier if you decided to swap the engine later. You can swap pretty much all of the d series relatively simply, the most popular one being the japanese zc engine. One of the main reasons being that some of the Japanese crxs came with the zcs. (I think.) Anyways this is a dohc non vtec engine with 130 hp, so it might not be a bad choice. Hasport also makes mount kits for the 1st gen. Crx to swap in all b series motors. This is a much more expensive route, mainly because of the price of the engines, the mount kits, and all of the other miscellaneous stuff that you dont need. Hopefully the site above should get you started and let you know some of the more technical questions that I can not.
Daniel