From your head number it doesn't appear to be the original engine in the truck. That having been said, if I were you, with what also appears, having a limited knowledge of the 216/235 engines, I would look for a replacement engine. Look for a 1955 or later 235 or 261 Chevy engine. It takes a different breed of "cat" to work on and keep a 216 running. Take that 216 and sell it or give it to somebody that enjoys playing with them. You will be dollars and donuts ahead, and a whole lot happier. --- Just DON"T drop a SBC into it. Would really ruin a cool truck.