3.55 vs 3.91

Im never going back to 3.91s. Im a 3.55 man now. With the 3.91s my car sounded like it wanted to be a Mustang.You know:upshift,upshift,upshift,downshift,downshift,downshift; repeat.repeat.repeat. Oh sorry,you have an auto.
-Thing is; Ive run nearly every ratio from 2.76s to 5.13s. The 2.66low M/T liked the 3.91s the best.When I got the GearVendor and the 273 ratio A-833(3.09low), I liked the 3.55s best. I used to swap those chunks out sometimes twice a week.
-I even ran it as an auto for a while; both 2.47low and 2.74low. The 2.74 liked the 3.55s. On the street, theres something to be said for torque.Try not to get caught up in the hp numbers race. A well built 360 doesnt need a lot of gear. As always; just my 2cents.
-IMHO, a good street starter gear for an 360sbmM/T is between 10:1 and 11:1. So a 2.66 box needs 3.73s to 3.91s: and a 3.09box needs a 3.23 to 3.55. Thats it.
-And since the A/T has magical torque multiplication; It easily gets by with a bit less, say 10% less. So working it backwards;10.5/2.74 = 3.83. less 10% =3.45. Nearest sz is 3.55s. TaDa. I know; long story. Sorry. Hope this helps.