[BR3W CITY]

I'd really consider replacing the springs ANYTIME you do a cam on a junkyard motor. While you won't need anything like beehive springs or doubles, a good set of springs and hardened pushrods should be done with ANY cam job IMO.

The added seat pressure could always prematurely wear and break an old spring. ALL springs have a lifecycle before they break. Its something I've seen with friends who bought performance-oriented vehicles or engines used.