Hello Tim, I agree, the dusty engine is more likely a late 50's early 60's Chev. 235. I noticed that the starter does have the starter solenoid, (the push starter linkage has been disabled). When I can get back over to the mystery truck and engine, with a wire brush, I will expose and share the numbers here. Right next to this truck is a similar vintage Chevrolet still with the original 216 in it. If the two trucks were put together, one nice pick-up could be built out of the two.
Al
Alan