well the injectos harness will be diffrent true, the OBD 2 just pull off and the OBD 1 have a metal clip that holds them on. there is also teh matter of the o2 sensor, there are 2 o2 sensors on a B16a manifold before it goes to the downpipe. obd1 and 2 have them before the cat. also if the motor still has the A/C bracket, look at it and if it has a part aht extends out away fro mthe motor where it bolts to the frame its either obd1 or 2 if it does not its obd0. also if the engien is OBD 2 the IAT sensor is not in the manifold, if its OBD 0,1 then its in hte manifold. (i have picts of that if you need them)