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You can get "Made for You" looms for center-bold VCs from Summit. Though they take stock wire sizes, they can easily be bored out to take MSD 8.5mm SuperConductors.
Check out the new ones from "Made for You" they have small brackets that bolt to your heads then run the wires along the side of the valve covers. No need to use the center mount bolts at all. I saw them on ebay but Summit probably has them. I have the Chevy Bowtie looms right now but am considering switching to the new style so my flamed valve covers are more visible.