Driveline is making transmissions now. If you just want a Pro Mod, send it to Tyson.
As far as the carbs, the 33’s might net a few hp up top. The 28’s will keep it very snappy and get right in the pipe. If you’ve already got the 33’s, it wouldn’t hurt to toss them on and take them for a ride to see what you think. But to jump to the big 38–39’s might make a handful more hp on the dyno, but would make it way less fun to ride.