We just finished the fab on a 69 camaro that left that had 18's and 19" and it looked really slick. 20's on the back would be to big unless you build your own frame so that it can be dumped. I have 22's on the back of my Old farm truck the C6-57, it looks dumb until you put the rear fenders on to cover up the wheel to almost the lug nuts.
I have found if you set different size wheels under the car at the height you have or can make happen the car will tell you what it wants. It will scream at you when it looks good.
Rodger
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