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From the looks of the 1st pics and the fact that it is a 78 CC it should be a Marine Power Engine. Unfortunately they are no longer in business.
I found an engine lineup that they offered, maybe this is helpful.
Do you have a decent pic of the boat? It sort of looks like a Lancer from you're avatar pic, except they were 23ft. It's hard to tell from the pic. Does a have a sliding hatch on the bow?