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This is my experience too. Last two cars I've needed head work I've rung round every 'engine shop' in the area + 50 miles, and the prices have been mental. Talking about skim of the deck, new guides, clean up (whatever method they use), check of cam bearing surfaces (extra to fix), minimal reface of valve seat, pressure test = £750-900 not inc any parts or extra work.
10 years ago used to have the above basics done for £150-300 depending how many cyl/valves.I think its to do with the way people just don't really do internal engine work on many modern cars, just bang a scrap motor in them or scrap the whole car. Motorbikes aswell, don't see many folks doing proper engine work, maybe a testament to how internally reliable many modern engines are though (that the trades who previously kept them going aren't needed so much anymore).
Dunno about over there but head work has got brutally expensive here since all the old boys that used to do it for a pack of fags and a sixer have wheelied off to the big workshop in the sky....450 bucks for a 3 angle valve job on a 4 valve single.
If you have rust in the intake like that, you’ll probably need the works, guides / seals / valves....almost certainly not worth it. Any other heads in the pile?