I would keep the parts just in case, but that's me. I found when I had my two and a Pro-7, the ejector system wa the big pain. Never had an issue over many years with the priming system. I traded up for two new LNL's a couple yards back. If it wasn't for the trade in deal, I would probably still be using them.
My my opinion is the primer tubes are worth gold since they were the weak link in being discontinued and hard to find. Guys with running units may want more. At least I did.
i do have Projector shell plates in #16 (223) and #22 (30 carb) if anyone is interested.