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If it's in good running shape, I would not bother with modifying anything. The price tag of changing over to the 94+ parts will likely cost you more than you paid for the engine.

The harness and controller for a 93 is not the 8051 controller and is not flash programmable. It you are putting it into an older TPI (or older) C4, I would consider going to the newer controller and harness if you need to do any tuning. If you are going to run the engine in a stock configuration, it would likely be easier to run the old ECM.

What trans are you going to run?
 
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