The flywheel may not be necessary but the adapter and bolts will be because the LS type crankshaft is shorter. You need the extension to make it longer to marry up to the old style flywheel and converter. The old style 60e doesn't have a bolt on bell housing so you cannot change that. I ran an old style 80e and it was only held to the engine with 5 bolts and that wasn't an issue.
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