Thanks. I can't remember the tail shaft angle off the top of my head. But I measured the output shaft height of the original 3-speed before I tore it out, and made sure the TKO was at the same height.
I suppose if a thinner crossmember was used, the trans tunnel could be dropped an inch or so. Strength and simplicity was more important for me.
If you want a more original look, the Keisler kit is probably the way to go. It must be a really tight fit though!