Currently running a b16 swap in my EJ8 and going to do a ls vtec swap over the winter. Ive got a donor B18B1 engine for my block.

My question is, will all my current wiring work with the swap or do I need the LS engine harness. I'm running a demon standalone in a P28 as the car was boosted but no longer.

 

Yes, the B16 engine harness that you are using now will work just fine with the B18B1 shortblock. At worst, if something doesn't match up, just use your old water pipe and thermostat housing and all wiring will plug up just like it did before.