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You don't need a converter you need to get the engine running right. I'm running a 10.5:1 408 stroker with a 508 cam and a stock converter and have none of those problems. Have you tried adjusting the carb and checking the timing etc? You may have a bad distributor.



I'm runnibg a 498 stroker and have a 22 to 2800 stahl. Car wouldn't idle when placed in park..would jump/stahl.Converter lets the tranny slip a bit at idle now.
A bad distributor would not run well in drive or at highway speed. The timing would most likely jump. Sounds like converter.