Will different color combo de-value my '72 Demon 340?

If your not building the car to sell to collectors, then I'd say do it however you want to! Obviously you're not to crazy about having all NOS-number stamped junk by your drivetrain(sound awesome by the way :thumbup: ) Thats the way I do things- yeah I still like to look some what factory but if its your car who cares if the paint isn't "right"!