3.73's aren't going to fix the fact that there's something wrong with that Slanty, a 2bbl on an Offy intake that struggles to do the double nickle? My '69 Dart Custom HT would do a top-end of close to 100mph, 2 passengers & Myself, about 490# payload on "Hunter stretch" which is an up-hill grade on the return trip. That's 2.76's & a bone stock 1bbl car with a Cerry Bomb, stock 13" tires replaced with 205/75-14's. Unless You're in the hills with some steep grades, I think the fuel supply or timing etc. needs some attention.
