I pulled the motor/trans out of the 89 with the ECM and harness still hooked to the motor. I ran the numbers on the motor, 3999289, says 70s 454, if it's a replacment motor could be 4 bolt. I never had the pan or v/c off. Runs 100%. Asking $1500 for everything, another $250 I'll throw the 400/Ford 205 in. Try to sell this one last time, then it will either go into storage or into the 92 Blazer.....All this came out of a running driving truck.....