$150 delivered to your door within the US. I pay an old, retired friend $120 for his machine shop work and solid cold-rolled steel. I purchase the grade 8 bolts, the 180,000 PSI threaded rod have it cut to lengths for another $20, assemble, provide photos and instructions, wrap/pack/ship. Last count I was only about $100 upside-down
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My friend Charles does appreciate the work and the small supplement to his "piddling" in the shop.
Once repaired, cover, cam, head, and cylinders can all be removed while the engine sits in her own nest - I know because I've had to do it twice before getting it "right".
Regards,
Gordon