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They make adapter plates to put perimeter bolt covers on centerbolt heads. Also most aftermarket heads are drilled for both options. I have black powdercoated cast aluminum perimeter bolts on the 383 in my Express van. My 1.7 roller rockers and .100 longer valves with dual springs fit under the short perimeter bolt covers. The short perimeter bolt covers are slightly taller than the stock centerbolt covers. They will clear the vortec compressor bracket with minor trimming to the bracket. If you get the style that angle down on the ends I bet they would fit with no grinding of the bracket.
