OK, well that midsection ID spells out a 1983 Evinrude 25hp, which is not where that powerhead came from. The number on the block core plug is the engine’s serial number, which is near impossible to cross reference to the model number. The “E” on the serial number just means this Johnson was built at the Milwaukee Evinrude plant. The “M” symbol stands for “Outboard Marine Corporation”, parent company to Evinrude and Johnson back then.
Good ol Gramps did some mixing/matching here. Probably took those stern brackets from a junked newer engine to fit on his old one. Do you have the engine cover? Has it been painted over? Post a picture if it is original, that can help narrow down the year/HP.
That light green color was first used in 1967, then again in 1968. Johnson went to a dark green in 1969-1971. Back to light green in 72. This engine has the standard OMC magneto ignition, so I am fairly confident it was produced in one of these three years.
