Okay, so we have an original 216. Good deal, thank you!
hang on!!! according to the link above
The 216's and early 235's have a valve cover held down by two studs running up through the center of it, and a tall side cover that the spark plugs go through.
Later ('54-'62) 235's and 261's have four screws around the outer edge of the valve cover to hold it down, and a short side cover that doesn't go as high as the spark plugs. 
