Depends on the vehicle and the condition it was in when you got it. Case in point: My family has had 2 early 70's Dodge Chargers. The first one we bought new in '73, and it was the family pet almost as much as our st. bernard. It was hit one New Years Eve by a drunk while it was parked on the street. That car I would have restored back to factory if given the chance. Years later, my brother bought a '71 Charger. It was ragged out and worn, one of the motor mounts was missing when he bought it, ###### interior from another car. It eventually gave up the ghost and the block cracked. That one I would have modded.