Grab that head and RUN- - - -do not walk away! I just rebuilt a stovebolt head with all new valves, springs, and positive seals for a parts cost of slightly less that $100.00. I even used stainless steel exhaust valves- - - -they're the same ones that fit a small block V8. Are you up for a road trip to Tennessee, or shipping the head to me? PM or give me a phone call.
For instance:
https://www.ebay.com/itm/193918558086?Jerry