The 2.95 1st gear versions had a higher torque capacity.https://www.moderndriveline.com/shop/transmissions/5-speed-transmissions/t5/ford-t5-5-speed-transmissions/t5-ford/The 3.75 first ratio is steep but these are the strongest, 310 ft/lbs rated and easiest to find. I like that the dual pattern BOP bell housing, came specifically behind the Olds V8, thanks to the Ford top loader option, allows it to bolt right on the F body V6 trans. Make sure the input length is right, it may need trimming.
The BOP manual transmission had the dual gear box pattern as the Pontiacs (maybe Oldsmobile and Buick too?) used a Tremec made 3 speed transmission.
The Ford T5 gear box pattern is different than the early Top Loader pattern. https://bangshift.com/forum/forum/bangshift/tech-section/2834-ford-transmissions
The Tremec 3550/TKO series uses the old Top Loader pattern.
There are adapters for bolting a T5 to a Top Loader bell housing but you have to watch the input length on the T5 because they do vary.