Is there something I'm not seeing here? A 60x head is no more complex than any other head. I had mine done by a local machine shop, Westchester Auto Machine, and the only thing special I had to do was lend them a spline socket to remove the prechambers. Hot tank, surfacing, new valves, seats, guides and stem seals. $600 and done. Maybe you'd need a specialist if you were doing a short block, but for the head? It's a flat, SOHC, two valve head. Tell me what's tricky.