I believe the hole size and the cam setup on a small block V8 is the same as the twist-in cap on a stovebolt six valve cover, but the only way to be sure is to try it. It's possible that your local auto parts store will have the same setup, instead of doing an online order. In case it doesn't fit, it's a lot easier to get refund from the local guy!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!