I'm in the process of planning out the build on my 1971 Roadrunner. Has numbers matching 383 4 speed motor with all factory parts, minus the carter carb and aluminum radiator(previous owner swap). The question I'm pondering over is should I rebuild the numbers matching 383 motor and 4 speed, or put in a 440 with the additional 4 speed I have so the #'s matching drivetrain won't get worn out or damaged? Would like opinions on the pros and cons to both set ups as well.