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What type of tires are you running ?

An old style tall sidewall 15" tire will flex alot more and probably need more clearance than a modern low profile 17" or 18" setup ?

I usually just shoot for having room to fit my fingers in between the tire and quarter and go from there.
(3/4" or so?)

probably 15 inch tires-with alot of sidewall like a 275 60 R15

Put a big block 4 speed Scat Pack Dodge in your garage.