416" on the dyno

Especially so when the converter is 4500 and peak torque is only a few hundred less than that. It (likely) carries max ve for that few hundred and in good air I could see it knocking a ring land off. Hopefully it will only nip the plug and it can be caught early.
Huh?
Having the convertor hit a few hundred over peak torque is where its at. I try to do exactly that. And in 50 odd years of racing( with a few gaps here and there), never wacked a ring or a plug.