He's full of ****. You can't "dry out" metal, and it doesn't have any moisture requirement to stay solid. I wouldn't run a full tank of 100LL mostly because you don't need that much octane in a street motor, but it won't damage the engine. The worst you will get is some lead fouling on your plugs and send some of that extra money out your tailpipe in unburnt gas if your compression ratio isn't high enough.
He's drying to duck out of his warranty.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, [email protected] in the quarter...still tuning.
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