Are we certain that the hub is freewheel and not cassette? Check into that before committing to a new-to-you freewheel.
You can also purchase a 39 tooth front chainring with correct BHC pattern. I think 130mm, but unable to verify at the moment. 38T were made but more difficult to find.
Last edited by tyler_fred; 07-09-20 at 04:39 PM.