The Dana I have I got from under a 55 Chevy 327 4 speed street car, 5.86s, ran a 12 inch slick. This was all back in the mid 70s early 80s. Just about every Chevy in those times had a 5.57 or lower, my friends 64 modified Vette had a 6.86! and sometimes a 7.17! I think it had 6 teeth on the pinion.(Dana) Left the line on the wood, no 2 step! 9000 rpm and up. The one he has now (Gran Am) has a 257 ci with a 7.50 gear. (ford)
I'm a Mopar guy but those cars launching and shifting where music to my ears. Allen said his eyeballs would move back and could see out both doors at the same time.