hi,im looking into swapping in a f23a1 sohc vtec motor into my 1992 cb7..i'v got alot mechanic experience.but my concern is the engine harness.can i use my original harness and just add a wire for vtec or should i swap the whole harness under the dash so im able to use the f23a1 vtec ecu? what else do i need to complete the harness swap so i can use it in cb7 and able to run the f23a1 motor?

note:i love to swap in a h22a motor but theres not alot of them where i stay.i do know a h23a is sitting in this guys garage buts incomplete.the harness is and ecu missing.