acceleration

1971 slant six block, a-904 trans. i rebuilt the head a couple years ago -- installed new valves; lapped the valves; set the valve lash while motor running per service manual; installed new pushrods; disassembled, cleaned and reassembled the rocker assembly; new distributor cap and rotor.

7.25 rear end from a 1976 duster, not even sure what the stock gear is.
does anyone sell higher gears for the 7.25? how hard is it to change out? i don't race or anything and for the most part, the 7.25 has been fine for the kind of driving i do.