The peak of the '66 valve cover is about the same as '67 and later, and it is the sides of the valve cover roof that drops down on the early covers. Later covers are definitely easier but early can be used with a few tweaks - you just have about a 1/4" less at the edge of the roof.
Use the Crower stainless rockers like Bart said along with the 3/8" cork gasket from Butler, and you might also want to go to the short polylocks offered by Crower. Not a bad idea to put them on for a little more clearance. Sometimes things clear with new gaskets but as the gaskets age and shrink you might find some contact in six months or longer. Using the stainless rockers, thicker gasket, and short polylocks gives some additional room for shrinkage.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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