There is a reputable Machine shop in Springfield Mo I have been using for over 30 years. Does all my machine work.
Motor Machine Shop
706 E Commercial ST
Springfield, MO 65803
417-865-0653
Ask for Mike Pickens, Tell him Bruce sent you. It won't do any good on a discount price. LOL. But I totally trust him and his judgment. If you happen to bring it to him, let me know I work second shift and I could meet you up there some morning.
As far as Crate motor goes. We can't get remaned engines through work here. There is a terrible parts shortage on internal engine parts. Haven't checked availability on a crate engine though. Go to summit racing and search for Ford 351 Crate Engine and look at all the ones that are not available.
If your building you own engine, Camresearchcorp.com will break in your cam on a machine without it being in the engine. I would have put in a link but work has that site blocked for some reason.