not sure I'm following Joel. You're saying the converter is simply not 'seating' completely to the flexplate?, and if removing some from the converter snout will allow the converter to fully seat? Or when all bolted up tight the converter is not seated far enough into the flexplate/crank pilot hole? That may simply be an '8HP' thing...but why would it have manifest with the 727...with a totally different converter?
You have a 'new' stroker crankshaft right...so the 727 'problem' should not have transferred to the stroker...?
...I'm sorry could you please repeat the question?