Alu OD 833

And if the loose front cluster pin bothers you you can get a bushing made up at the local machine shop. But for a driver, I wouldn't bother. They shift fine with lightweight gearoil. In a low-powered unit I prefer ATF . I run 50/50 in mine and drive the berries off it with about 400hp. The only reason I put 50% EP oil in there was cuz I felt sorry for the clusterpin. And it didn't shift that much slower after it warmed up,lol.
Myself I like the longtail cuz; A) it was a direct fit with the bigger 727 sized mainshaft, and the 727 driveshaft, and B) the shifter pad was further to the rear, and I installed it yet further back, between the buckets.
The A/F's I bought had the smaller 904 sized output shaft, and I didnathink they were good to 400hp. But for your stated useage that shouldn't be a problem.

That trans works very well with a hi-torque,low-rpm engine, and about 3.23s, but not much more than 3.73s, else you will be shifting into second almost right away. Nor any less than 2.94s cuz then second will tank, which is worse.
4.30s sucked big-time. 3.91s were good for a peppy second gear.I liked 3.55s the best, cuz I had enough torque to pull them and 65 was 2100; and my little 223*@050 cam was ok there.