These guys in TX are highly regarded in VW world and have been around since 1968
https://www.headsonly.com/category/volk ... nder-heads
Clearwater I FL did a nice job straightening a 1998 head for me a couple years ago
https://www.cylinder-heads.com/about-us ... gJnr_D_BwE
Center reach machine shop in Long Island is my local place, pricey, but it’s NYC after all. $500 all in for machining, new guides, new seals ( my parts)
No webpage but they are on Facebook
Dave Hunts machine shop in Schenectady , excellent, backs up hard in January for racing season , typical 12 weeks
His price list his online at his website
http://www.huntsmachine.com/index1.htm