I have the Ford Motorsport 1.72 ratio rockers on mine, and the cast valve covers fit without any clearance problems. The baffles are still in them too.
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1985 Mustang GT
'85 GT "Red302" 12.96@107.1 N/A ... Sprayin' for the 11's
2003 Torch Red Mach1 
'68 Fastback ...331 Stroker "Restomod"
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