Stop in for a cup of coffee

Mattax said
Alot depends on the lift and the baffle design to keep oil out of the breather and PCV

Factroy design is pretty smart with hte angles - this one is for a small block

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This one is also pretty well thought out
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The little flat plate on the cast ones clears but isn't that effective.

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Yeah, the main thing is the roller rockers are pretty large, i would honestly prefer just stock covers painted to match the motor but i know they won't fit.. don't really want to spacer them up as that just adds a lot more area to leak