I recently acquired a 61 Larson 16.5 foot Fiberglass Tri-Hull boat with a trailer and a Merc 800 for $350. I was told that the engine did not run. I popped the case off and to my surprise, THE ENGINE WAS TOTALLY REBUILT! I mean rebuilt carbs, new rotor and distributor cap, new pistons, requilt power head, new gaskets, and it was even freshly tuned! How much do you think that this engine would be worth? (Just a ballpark figure) Are these good engines? Do they charge the batteries when they are running? Do you think that it was a good purchase or did I get burned?