I did not have an SS but an 87` 442 Stock frame, I had 8.5 *18, I could go bigger, but not much, maybe 9.0 at most. 9.5 With easy driving/show. I like to have some room for movement too.. And With Stock bushings and such, it moves around..
But they have different bodys, so I dont know. And a frame notch does alot!