"I am trying to identify a gray Marine 4 cyl with alternator on right side, dist in right rear bell housing. Block cast is CWC 2 F219. On the Exhaust manifold is GR 1 152 with 12 13 87 tagged below it. On the head next to the firing order is 2983 with a BZC below it. In the bell housing rear right side are three numbers stacked. They are 75532, 77743, and 77747. Any help would be greatly appreciated. The motor is in a 1954 Lyman Islander 18'."