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Not sure if I can help much, but that particular model is the last year of the opposed twin A model Johnson built. In 1930, the model became the A-50 (4hp) and it was an alternate firing twin with the revolutionized "under/over" engine design, which is still in use today. By 1939, the model had become a 5hp. The 1938 was the 4.2hp and the last model year with the "all cast iron" cylinder assembly. 1939 was aluminum with cast iron cylinder linings.
Believe it or not, that is also the model that the old TD, CD and all the other 5 and 6hp Johnson outboards derived from.
The LT became the TD and the TD became the TN and then the CD went from there.
Enjoy that old classic. You will be amazed at how easy it is to run and how reliable it is. The old Johnson A model was the motor that made the definition on "old outboard reliability"