318 rebuild Bonehead mistakes/misses and questions

I won't use cork, since even if it doesn't end up with a leak it softens and seeps oil eventually, and even if you go back and tighten bolts it eventually kills the gasket.
The black tar paper looking stuff never leaks with a touch of RTV on each side.
It's not nearly as sensitive to over tightening either.
Same with valve cover gaskets (rubber over steel reusable gaskets instead of cork)
My trans pan gasket is a rubber over steel reusable type also, so no cork there either.
The output shaft bearing cover is pure RTV for the same reason.