8 to 10 hrs labor to change '225' head gasket ?????

By the sound of it, you seem to think it's his fault if they break ??

Why so??

Edit - Actually,, I just reread your post, and perhaps took it wrong..

Working on the intake/exhaust studs on a slant this old can be iffy.
Studs have been known to snap frequently. Once one snaps,it sucks removing them. Soaking them with your favorite penetrator is a must.