Preferably a 12" rim, but you can make an 11" fit if you want to run a shorter sidewall with a lower profile. With a taller sidewall on the smaller rim, you're more prone to get lots of body roll when cornering and the tire will sort of overlap the rim so to speak. At least that's what I've been told. Maybe someone else can chime in.
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'68 C10 swb
'69 Camaro convertible
'72 Chevelle
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