If you need help ID'ing ratios, etc., go to
www.dandltransmission.com
Saginaws came with several low-gear ratios. The 3.11 ones came in some 6-cylinder cars in the '60s, & in '73-'74 Vegas. 3.50's came in some of the late '70s Vegas & clones (Monza, etc.). My '72 Nova came with a 2.54, but I changed it to a 3.11 years ago. With the stock 10.4" clutch, I have had no problems with it, even with a 350 engine. I wouldn't subject one to abuse, because they're not real strong, but I'll probably put one in my truck in the near future, probably column-shifted with a separate lever for reverse.