If you want to be able to bury the tires up in the wheel wells you will not want to go any wider than a 275. I know there are a few guys on here running wider tires, but not on 20s. I have 275/40/18s on the back of our '66 and they never rub. 18" x 10" with 5.5 bs. Original 12 bolt with SSBC disc brakes. No body or wheel well mods. Not sure who offers the tallest tire for a 20" wheel, but watch the front of your wheel openings for quarter panel/tire clearance. If you get too tall of a tire you may see clearance problems there as well.
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