best size rear tires for my centerlines?

[Lynn]

Sure.
I think 4.5, or something very close to it. I remember spending a lot of time getting what I wanted. Most of the off the shelf centerlines available were less than 4.

The YH ralley wheel is about 4.25 and is only 7 inches wide. To get the outer lip completely inside the wheel well, you have to have something over 4.25.

SOME 275 tires might fit. I wouldn't corner hard though. I had purchased a KILLER looking set of 275 Hoosiers from Eric at a very fair price, but was too scared of burning the paint. Probably would be OK for straight line. Sold them to remove the temptation. Didn't make any $$ on them, but they went to a good home. Of course a couple years later, I put some vintage Centerlines on my 68 El Camino, and 275's on a 15x10 fit great on that car.

You can see in one of these pics how close the wheel comes to the lower shock mount.