Hermy's in Port Clinton, PA has always been reasonably priced for me. I would give them a call. Sounds like water damage making the brass parts corrode. Could be from Ethanol, did it sit with untreated gas in it? I use Stabil Ethanol treatment in all my gas engines when parking them for the season. Sounds like quite a bit of corrosion though, hope the passages in the body are still open.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!