what will I have to do .. to drop into EK

i pretty much know how to do it, but the wiring harness.. is the question..
can the wiring harness off the EK plug right up to teh obd1 LS engine?? or will i have to extend some and re-wire teh LS wire harness some? lmk thanks in advance.. i'm just gathering info before I jump on this project..

since the Ek wire harness does not all come out like all bseries harness