383 deck

It doesn't seem, from the picture, that you would have a gasket leak into the combustion chamber. But it may leak at that cooling port, to the outside of the engine. If it was mine, I would deck it. Also that way, you can check it for square, and be sure, both decks are the same. Also depends, what your intention is for engine. A lot of guys want to deck a 383 to get the compression up..There...you have my 2 cents...I would deck it.