I would venture a guess that the clamp and front cover are 1983,and the block was changed at some point in time.
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I'm gonna have to concur. I purchased the complete engine off of a guy who had it mounted on a Checkmate. He never mentioned any prior work done to the engine, just that it had low compression and needed some work. I pulled the engine from the boat and separated tit from the mid with the intention of rebuilding it. When I dropped it off at Layton, he noticed his own work he had done to one of the cylinders many years prior. I've had it stored away in the garage for almost 2 years now.