Here's my thoughts, my 92 Blazer, with the 28" MT slicks would go through the 1/4 at 55-5600 with the 4.10's (12.78 @ 103). If you were tubbing and could squeeze a 29.5 you would drop that about 300 rpm's. I put the 3.73's back in mine and go through at a very safe 50-5100 rpm. That's probably your best bet.

I'd think you're gonna go mid 12's. Not bad for what you've got and plenty of potential to go faster.