T5s are cheap. Figuring out a bellhousing would be the most difficult part......and it just "ain't" that difficult. And from 85 on up, the first gear ratio in the T5 is 3.35:1. It also has a .68 OD ratio.
3.35, 1.99, 1.33, 1.00, .68. Better ratios than the 833 OD.......at least better for the slant.
Hear are the 833 OD ratios:
3.09, 1.67, 1.00, .73
The T5 has a shorter jump from 1st to 2nd and has a better OD ratio. The slant would respond better with the T5.