The mechanicals are all about the same. The motor is OBDII and will definatly throw some codes on your OBDI computer. The easier thing to do rather than swapping out your computer and harness would be convert the LT4 over to OBDI. By that I mean take all your sensors off your old motor swap them to the LT4, maybe block a few things off you dont need and you should be good to go. Your getting a good motor for that price and miles. Great heads and intake plus the block is 4 bolt mains. Good Luck!
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