4 or 5 speed 65 Dart

A lightweight Dart with torquey 360, for street duty, would probably not need a 5 speed. A 230* cam,with a well matched Dcr, makes lots and lots of torque down low, so steep gears are not required, which makes a 5 speed almost unnecessary.In fact the auto, with a nice stall, and 3.23s or 3.55s, would be plenty fun.
But you didn't say you wanted it to be a streeter,and you didn't say you had unlimited play money, so choice is still up to you.