old valve covers on newer heads

[jocko]

Good evening folks - quick "pcv" question - I'm interested in sticking a set of old vette valve covers on a newer gm crate engine (the holes line up - it's not a center bolt valve cover crate and the vette covers are straight hole not staggered) - but I'm trying to figure out how to have a useful PCV system... The intake manifold I'm going to add with the vette covers is an early 60's offy piece and it has the oil fill tube up front, so oil fill won't be a problem - but am concerned about building up crankcase pressure, blowing oil from the filler cap, etc etc.

Any ideas how to make this set-up work? Making a newer 350 crate look old has some nuances I hadn't thought of...

Thanks!
jocko