The valve cover looks like a 216. A picture if the other side would help. 216s have a big sheet metal side cover that goes all the way up around the spark plugs. Some trucks had an early 235 that looked like the 216s and I think the early power-glides had a 235 that looked the same as the 216. Two bolts on top of the valve cover = 216. Four screws in the valve cover rim = 235 or 261.
