Rear end gearing tech question

I have a 1973 duster. I am installing a 360 that has a lunati voodoo cam, edebrock aluminum heads, Harland roller rockers, full electronic mad ignition system, hooker super comps and a procharger running 6-8lb boost. Have a new 904 transmission that has been built to
Hopefully withstand the hp I will be producing. This car will not see the drag strip, just a fun street car. I am concerned with the supercharger and motor work done, about what gear to run. I will be purchasing a locker kit, and was thinking 3.73 gear.. i want something that has good go but still keeps me modest enough to cruise highway.. if I'm off please tell me as any criticism is helpful. Like I said this is not a drag car, just a fun driver.. im also running fitech fuel injection.