i rebuilt the caddy heads and did work on intakes and ex logs. most all parts can be had or can be made like pistons like forged. but cast will work fine. cam can be sent in for a regrind . valves and valve springs are not a big deal .i know a guy that has a old hot rod caddy engine he pulled it out of his A pickup.he has had this pickup for over 50 years . so the engine has all the old race parts on it and in it about 5 miles from my shop he called it the noisy toy