I am building a almost 12:1 499 low deck for my 70 swinger. it will have TF 270's, solid flat tappet (for now), indy max wedge single plane, 1050ish dommy, rmvb 727 with lots of a&a goodies, lupo 9.5'' convertor (i'll be sending it in when i decide on gear ratio), 325/50-15 drag radial ''r''. my question is, has anyone run a similar set up with a 3:54? should i run the 4:10? i dont do a lot of freeway driving, but would like to. i am trying to keep the rpm's down while cruising too. i currently have a very nice, braced 8.75 with a 4:10 in the car now, but i have a dana ill be narrowing with the 3:54 factory gears. let me know what you guys think, and thanks for the advice!