5-5.5" would be ideal for a 9 with a 275mm tire in a stock wheelwell so add at least an inch to that to fit the additional inch of wheel and maybe a hair more to handle some extra tire width and sidewall bulge for the larger tire and the tuck the Ride-Tech will provide. And since these are 45 year old subframe cars made on multiple assembly lines that you're now modifying, it's a good idea to take a few measurements beforehand.
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