Spun dampener

Are you sure it's "spun" or maybe used different timing marks? Reverse rotation is of course a possibility. So far as I know all Chrysler rev. rotation engines used gear drive cams and a great big adapter on the distributor to control the reversed thrust on the helical gears


"Back in the day" this seemed to be common on 60's Ford 352 / 390s. This is when I learned about piston stops.