Looking for advice on fixing my leaking valve covers. SBF, GT40 Y303 alum heads, using the felpro molded rubber steel core gaskets, SFL1684 I believe. Valve covers are cast aluminum ford racing.
These always leaked on me, the mechanic who saftied my car last spring suggested what they do since the mating surface on the cast covers is rough, is put "The Right Stuff" between the gasket and the valve covers, , which I did.

It seemed to stop leaking for a while before starting again, and seeming to get worse. I just pulled off the drivers side, was able to pull the gasket with the right stuff off the covers clean, but its stuck to the gaskets forever so unless someone thinks gooping on more right stuff over the old is the solution, I think these gaskets are toast.

Looking for suggestions on how to best seal these covers on. I do have some new Felpro cork gaskets I could use, looking forward to finding the silver bullet for this one.

Thanks in advance.