there will be some wiring involved, to get you car to MPFI (multi-point fuel injection), then converting to the ecu to OBD1 if you get a 94 or newer b18. It is a pain to go to OBD1 but in the long run i think that it is worth it so you can run something like hondata ( http://www.hondata.com/ ).
other things that you may need,
-throttle cable mount (do not know if you actually need this)
-92 GSR upper radiator hose
-90 Integra lower radiator hose
you are probably going to want to change the timing belt, and the rest of the belts.
and the water pump and thermostat.
if you want i have an Excel list that i am using for my b16a2 swap if you want i can send it to you it has everything needed, and you are planning a similar swap it sounds like. Just send me a PM.
Basically you only have to convert to mpfi if the crx you are buying is a dx. Coverting to obd1 is not that hard. If the engine is a 92 or newer then go to obd1. Try to use the right ecu for the engine to aviod problems. To make life easier get a 90-91 integra engine. since it is obd0. If your crx is an si or an hf you will have very little if any wiring to change. You need to get a cable transmission for the car, which is a problem if you go with a 94+ integra tranny.
I'm getting the whole ls engine with tranny and ecu. So i wouldn't need to make the ecu obd1. The only work i need to do is make the ecu a vtec and make the fuel curve able to give enough fuel for turbo. Ho should i go about to make the ecu vtec? Can i use the ls tranny in a crx?
The ls motor is not vtec. You dont make the ecu obd1, you use an obd1 ecu if your engine is obd1. If the ls motor is 92-95 you will need wire it for obd1, or buy the obd0 ecu, an obd0 distributor, injectors, and a few misc. parts. DO some more research before you buy anything.
The car is going to be eitther a 1989 or 1991 but definitly a crx si. The engine i'm putting in the car is going to be a 92-95 b18b1 Ls engine. I know i am going to have some wiring problem because the engine obd1. I am looking for some one to send me to a website that shows how to do this set-up or shows a wiring diagram of crx engine harness and pin-outs to the ecu.