With a T56 and 4.11 8.8 rear @ 80mph I see about 2300rpms, in 5th at the same speed it's 3400rpms.
I almost don't need 1st anymore. If or when I hook up nitrous I'm wondering if I should just launch out of 2nd. I really haven't tried anything hard with it yet. Currently on 200 miles of a 500 mile break in. The whole drive train has been upgraded so it's all new. This week was the most miles I've put on it since Nov 2012.