Responded to your pm. Darn it, hard to finish while at work.
A street car(500hp), just glue a Fel-Pro gskt to the cover using 3M yellow w/strip adhesive #8001. No rtv between gasket and block If you cant get a good cover to block seal, use Permatex blue rtv(cover to block). It's more stringy, and removes easier then gray or black.
Big HP engines need the gray or black rtv to stay sealed, unless you have a vacuum pump.
