What is the correct timing for a 1990 Chevy pickup 4x4 5.7 engine?

18436572 0 degrees BTDC The base timing must be set to 0 degrees with the timing connector conduit disconnected to bypass automatic timing. With timing set to 0 degrees, reconnect the conduit and the computer controles the timing. This conduit is located on the wiring harness on the right side of the firewall, under a Y shaped plastic cover. It is a one wire connection that protrudes from the wiring harness. It is a tan/black stripe wire.