CAM Spec Question on stock 401 Engine

With a reworked head there is no way to know without measuring. It depends on what hardware he used, and there can be a tremendous variation, and what valve seal machining has been done. You will have to measure. The only thing to further say is *likely* if the heads were reworked by a performance guy they would be set up for a performance cam typical of the application. But if you are changing cams you likely have to change the springs anyhow, and you need to measure and adjust all this for spring installed height anyhow. The catalog springs may not suit a reworked valvetrain - it has to be measured.