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3rd gen LT1 swap = unbolt gen1 sbc, drop LT1 onto same motor mounts, hook old exhaust back up, run wiring.
other than running the a/c lines(since GM changed them every year in 3rd gens) and running the new wiring/splicing into the old harness it is extremely straight forward.
the fuel lines are easy to swap over, and if you keep the whoel engine harness under the hood like 4th gens have it, the wiring is even pretty easy.
do a search in the TGO engine swap forum, any question you can think of has been asked there.
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