Re: Help me identify this motor
The Johnson JW series was introduced in 1952. It was the ancestor of a family of 3 to 4.5HP twins that were available for about 50 years. They were, in my not-so-humble opinion, the best outboards ever made, by anyone, anytime. Yours is missing the lower cowling. Try the list of outboard salvage yards from the Top Secret File at the top of this forum.
The '52-'56 JWs used Champion J6C plugs gapped at .030 to .040". '57 and later used J4C plugs. I would use J4Cs in any of them, gapped at .040".
All set the points at .020"
Very likely it needs coils, as they have a short (40-45years) life.
You have acquired a real jewel. Get her running right and you will love her forever, because she will love you.