As long as your engine is full of oil and you have a good radiator full of coolant, you are not going to hurt a 216 at 50 or 60. Back in the 50's they were usually driven at that speed if the road allowed it. If you are afraid of engine speed, I would invest a few bucks in dropping the pan and plastigauging the babbits and making sure the dippers are in place. If your babbits are good and they get oil, don't worry about it. You will get accustomed to the fan, and valve train noise. Remember there isn't much between you and the engine on these old things. In fact unless you have replaced grommets, there are several places you can see the engine from inside the cab.
