Looking at the pic, the suspension pieces look pretty fresh, you said he re-did the front end, it seems so.
The calipers look rusty, but that's just cosmetics. The 2 things that count are the piston surface and seal.
Whether that caliper sat on a shelf for however many years, or is on the car, it should be fairly fresh.
The rotors can be turned, they appear fresh , find a machine shop to measure and machine as nec. Let them decide.
You got a nice car there, you're a lucky fella, - and you found the right place for help.
Don't be in a hurry to replace perfectly good stuff .
Good luck