You'll need to get an OBD0-OBD1 jumper harness, an OBD1 ECU, and an OBD1 distributor.
The ECU will need to be socketed and chipped. You will need a p28, p06, p30, or p72 OBD1 ECU.
*Note- If you are running the stock GSR intake manifold, you will need a p72 ECU if you want to secondary butterflies to operate.
You can search LS/Vtec and B20Vtec on here and find complete how to write ups as well.