340 Chugging instead of Reving

fishmens67 said

Could it be the valves aren't closing, firing through the intake and exhaust.
If that be the case, there would be a lot of unburnt fuel
and misfiring

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I agree and a leakdown test is the only thing left to check. The compression test had solid consistent results. I ran a dial indicator on each valve spring retainer and lift was consistent on all lobs. I may be able to do a leak test this week and I have a plate to bolt on in place of the carb to test for an intake leak on the valley side.