Lyle, you should always change the lifters when you put a new cam in, most cams are sold as kits with matching lifters and in many cases new valve springs. Changing the rockers is probably not a bad idea, especially if they are original. 40 year old rockers would be suspect. Standard replacement rockers should be just fine for a street application. If you are going to pull the heads, then a valve job makes sense, make sure you have them install hardened seats as I mentioned earlier. That will make them last a long time with the unleaded fuel. That engine was designed to run on leaded fuel and the lead served as a lubricant for machined surfaces such as valve seats. When the switch was made to unleaded fuel the older heads sometimes had problems. That may be a good reason to switch to later model heads. I would not suggest raising your compression significantly given our currently available fuel.

Pat