I think he just wants to know if the Super T-10 will hold up to the big block. Not about what ratio to run.
7T8 LT,
As for the Super T-10 and the big block, I had a 26 spline, aluminum case, super T-10 behind a blown 468 cuin big block in a Pro Street 57 Chevy with a narrowed 9 inch rear with 15.5 rear tires. It was in the car for about 10 years and held up. I was far from easy on it. I didn't get much traction though, so that may have helped. It would probably be a different if the rear tires "hooked" up better. Slicks would have probably killed the trans. I launched it once, got good traction, and broke both axles in the car and the trans didn't break. So the T10 will take some abuse. The trans was bone stock out of a 1979 Z/28. I just rebuilt it before I put it in.
Also, after seeing how mine held up, a friend of mine put a Super T10 in his 67 Camaro that had a crate 454 LS6 with a 4:11 12 bolt and didn't break it. He also had some traction issues..lol. For the street, cruse nights, shows, I'm sure you'll be fine with the T-10.
Mark