ls vtec ecu setup

ok i tried searching for this but could not find the answers i needed. i’m using a b18a block with a b17 head. my question is what ecu is best to use? can i use a pr3? will the stock wiring harness plugs fit the pr3? is there wires i need to switch in the plugs to match the pins in the vtec ecu? i know there are empty spots in the wiring harness but will those match to the pins on the new ecu to wire in the vtec solioned and pressure switch?
car is a 90 gs obo 0

thanks