My '75 Scamp 383 Build

To re-use your old cam, you would need to put each lifter back on it's original lobe. This where I would upgrade the cam with new lifters. Reuse rockers, shafts and pushrods if decent. Usually we replace all the valves and springs. On a budget- you can reuse the old valves if there is enough meat on them for grinding. Reusing old springs is a little chancy. Resurface the heads along with v/job.