I am the 2nd owner of a 1967 mustang, It was originally a California car (until two years ago where it is now in the mid west area) and I believe other that some usual replacements parts ( heater core, radiator, fuel pump) the car is completely original. No body work has ever been done on this car. It may have had a repaint at some point due to California sun. My question is that the dash pad is slightly cracked and the plastic around gauges is somewhat faded/dis-colored. Should I replace with new pieces or keep the originals in place for value? Any opinions are appreciated.