I am looking for a outboard for my 13ft inflatable. I have come across a 67-68 johnson 20 hp 2-stroke. It is in "perfect" running condition. Compression is 135 and 138, spark is good. I am new to boating and don't know anything about motors. what would be a fair price for this motor, can I get parts for it if something happens, how many more season could I get out of it? Your help is desperately needed and greatly apprectiated. Please help