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I am going to do a 440 source 512 stroker in my 68 Imperial. When I called them and told them my goals he said I should do roller rockers but said I would have fitment issues using my stock valve covers and would need to do some grinding on the rocker arms to get them to clear. Does anyone know...

I have a 68 Imperial Crown with the 350 HP 440 the factory service manual says it should have A holley R3918A which i believe is a version of the 4160 4 barrel carb i have never really paid much attention to the carb as i havent needed to service it. Well it has been sitting about 10 yrs or so...