Well it is different between the dx, si, and "civic" models. If you have a 4 spd tranny it is the "civic" model, 5 spd tranny it is a "dx" or model, and if you have a sunroof its the "si". If you have the "civic" model you will need to convert DPFI to MPFI. If it is a dx or si model you will just need to swap the wiring harness off the dx motor and put it on the obd-1 ex motor. You will need to take the drivers side main mount off the stock motor and swap it on the obd-1 motor. You should probably buy an obd0-obd1 conversion harness because it makes it easy to wire up the dizzy and run vtec and use a p28 ecu.