My son has a T56 behind an LT1 in a '95 Camaro. He's had it apart changing sycros & forks. Bought a Hurst shifter, cut it down on the lathe to get a shorter (quicker) shift pattern & it's still a pig on the track. It works great on the street, but try to shift it fast on the track & it just refuses.
We dropped my Rossler 210 in it this summer (no runs on it yet) to see how much of a difference it will make. A bunch I'm guessing.