There is alot of info on that swap. I did the same swap to my 89 crx si, just with the info on this site.
With mine I used the stock si engine harness, I needed mounts, 90-91 integra axles, 90-91 integra ecu, injectors, injector resistor box, and shifter linkage. I didn't have to do any actual wiring besides extending the o2 wire. It is pretty much plug and play. The toughest part was figuring out the vacuum lines but there is a ton of knowledge around here.
You need to ask specific questions as they arise.