Tightening the body bolts was a new car pre-delivery requirement back in the "olden" days. I don't not remember seeing a torque wrench being used, if fact there was no torque values given for the tightening of engine parts back then. I would select around 50 Ft. pounds. There are no actual rubber cushions (before 1955), just rubber spacers to prevent metal to metal contact. In the later years when cushions were used the torque was around 30 ft. pounds.
_________________________
Chevgene