Suggested wheel size for rear

Well,,,,,the rear will be approximately an inch narrower than stock .
The perches will be approximately an inch closer together than stock .
The rear will be an 8 3/4,,,,,cut down to an A body length,,,actually less than an A body is because the A body has an 52.6 rear tube to tube end ,,,,approximately .

I’m just looking for about the biggest tire I can put into a factory wheel well.
I’m not building a race car,,,,this is a nice performance street car .
It will be performance,,,,but really closer to the stock end of the scale .

All I’m changing will be the driveline .
Rear,,,,then engine and transmission .

I’m just looking for experienced opinions on what works in the factory hole .
Not shoved full until it rubs,,,,,just what works the best .
I can measure the wheel Wells and calculate what I need,,,,,but I’m looking for real world experience on what I might encounter that I haven’t thought about .
Thanks .

Tommy