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Sears 140 is a what???? Boat, motor, fishing pole????? Please post a picture or two and people will try to help.
Sears did make a fiberglass GameFisher in both tri-hull and semi-V hulls. They also made motors, though I didn't know they made a Sears Gamefisher OB in a 140. I wonder if that is the designation for a 14HP?
140 could mean it is 14' long or just a model number. Those pictures show a boat and motor in rough shape.
That's the thing with "Sears" labled boats. Back in those years Sears would let a bid for what they wanted that month and the lowest builder got the contract. They literally had dozens of manufactures over the years.
That engine looks a lot like a Clinton engine and if you take the cover off and snap a couple pics we can probably help narrow it down.