Now, it calls for true ingenuity-and a pile of wiring diagrams. Starting with an engine ... due to its larger design, the LS1 PCM does not fit into the vehicle's recess where the archaic EEC ...

Compare either of those to the LS1 that came in the '98+ F-body and ... To do this, you will need to find a wiring diagram for both your stock car and the engine harness from your donor.