Brought home the 140 HP motor, I think. The serial number plate was removed and it had been worked on some. It is a newer one because it does have 4 coils, 2 CDI boxes and no distributer. He had two 12V bats connected in series (24V) to crank it up. I mentioned about that much voltage can damage some things. He says the bats are bad and can only get it to crank with both.
It cranked slow and only started to fire one time. most the time, the starter would engage but only move the motor a tad. Pulled the plugs and compression was at 90 to 95 all cylinders but turning so slow I think this was the only good sign. The head is flat (took pics but unable to upload due to IE11) and think it may just be a 140
The guy has OB's of different types all over the place. Also has a 120 (does have serial number plate, maybe 1973) which is all rusty. WOnder if the 120 is worth buying just for parts, but block may be cracked, don't know