You are certainly playing with better quality, more forgiving clubs, than most relative beginners have, so they will not prevent you from learning a good swing, and I would definitely not part with them.

As your heads are investment cast, they tend to feel "harsh," and because of that it is more difficult to discern the different feel between a good shot and a poorer one. Being in the process of learning a golf swing, the wonderful feel of centre of face contact may not be important to you now, but as you become better, you may learn that it is one golf's more delightful experiences. So, in time you may want to consider a head with a softer metal(431 stainless instead of the 17-4 of these Pings) or you may want to go all the way to a forged cavity back head. On the market there are heads that actually have a forged face and a cast back, as well. They feel great.

The older Ping irons tended to be shafted with stiffer than required shafts, although what you have may be just fine for your swing at the present. Very often older clubs are rusting from the inside so there is an increased chance of breakage and potential danger to you. Replacing the shafts with a little softer flex and matched to each other better, is something you may want to consider in the future.