looking to use a set 3/8 or 1/2'' small block la valve cover shims for clearance issues with my intake.
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He is absolutely correct = Cut the manifold!Grind the intake or covers. Spacers blow. Only use as last resort in my opinion. Just another item to leak. Very common for the mopar covers to hit the intake runner and need a little massaging.
If you need those, you're running a much bigger cam & roller rockers than I am on my bracket car & I don't need any spacers. I'm running a Comp .690 intake, .660 exhaust & Harlan Sharp roller lifters.