You could use valve cover spacers, but they are pricey. Medice Mfg makes them. I have a set on my 511 RB with the old cast aluminum M/T valve covers which have baffels in both sides.
I run the Hughes aluminum roler tip rockers on a Comp cam with .595 lift and have plenty of clearance.
74 Challenger, bought it new. In 1978 I replaced the original 318 with a 446 and 727. Mild cam, Jardine headers, and Holley Sniper EFI.
New engine! 511" RB, Edelbrock Performer RPM heads, Eagle rotating assy, Comp hyd roller cam, Doug's 2" headers.
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