depends on what year the motor is and which on board diagnostics (obd) it is. obd0 will be the easiest choice for this car because there is not as much stuff to switch up than an obd1 or 2. I've heard of some people taking the factory harness and just adding the vtec wires and the wires for the 4 injectors to go dpfi to mpfi, and use that for b series swaps. ecu will be needed as well and possibly some mounts , my buddy had to get hasport mounts to get the ls to sit right in his ef, but he barely has any space, which is why i said they are tight cars. There are plenty of threads already covering all this, just search the pre-92 section.