Yup, on my boosted car, I ran a 3.55 trans. It would let me get into low 120's in the quarter without shifting into 5th gear. I don't know what i'm going to be doing this spring. I am hopefully going to get a tall enough tire under there so that I can stay in 4th with my 3.94, but I'm not sure of it yet. Time will tell.
My internals are for turbo applications, and result in 8.1:1 compression, so I am decking the head .045" and then removing the .023" shim in the head gasket for a compression closer to 10:1. It will be a bit more ..... fun
The only problem I'm running into is weight of the pistons. I am limited to a rev limit around 7200 rpm. I ran this for a whole year and had no problems, but I am really nervous of cranking it up any more. Without going to a lighter piston, they are known to just grenade from stresses of spinning them any higher.
--mark