the valve cover gaskets on my 305 are pretty bad, leaking oil onto the manifolds and everything, so i bought a pair of rubber valve cover gaskets to replace the leakers. once i get the valve covers off, im going to either have to grind the surface or get all the crap off. but my main question is what is the pattern to use to tighten the bolts down. dont wanna get em back on then blow up because i didnt tighten them right.