Best Valve Cover Gaskets?

Those are good , 425-430 HP out of a 318 is very good . My 340 , ,30 over with 10.5:1 pistons air gap intake only makes 413 HP . Can you give the specs ? Is it factory stroke and bore ? Like to know the specs as I have a 318 in the garage , 430 HP would suit that 318 , let us know what's in there .