Sorry, I don't know of any shops that specialize in Stovebolts. I would think any good machine shop in your area should be able to do the basic machine work needed so you can rebuild it yourself.
Maybe someone else can help.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD