Go t56. alot more entertaining to drive. My father in law had a 67 chevy II that had a ls9/6l80e combo. It was fun, but after numerous issues with programing etc switched to a t56 magnum. The car ran so much better, was alot more entertaining to drive and no programing issues to worry about. The engine felt alot more responsive and revved alot more freely. just my .02
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