I would take them off and store them......as far as what to use after you do that....several choices, depending on the type of sound you are after. You could get new Ludwig weathermaster coated heads if you still want the original look......you could go with Remo's ambassador coated, or even better the Vintage a's, for that traditional 60's sound. Or you could go with the Fiberskyns for that more calf like sound......although remo states that the rennaissance heads are even closer.....or you could go with Aquarian Vintage heads, or texture coateds for that fact. I personally like the sound of Aquarians over remo.....they tune up faster and seem to last longer. Only one issue I've ever had with Aquarian....the hoops are a little thicker and sometimes wil not fit the toms....in other words too tight on the shell. But I've only had that experience with one of my kits and it was from the late 80's, not the earlier ones....go figure!
Ludwig's heads don't sound bad, they give you the original look, they are just harder to find. Even my local Ludwig dealer doeesn't carry them anymore....just not popular enough I guess. You can get them through Interstate music or 2112online for reasonable prices. They are a little more fussy when it comes to tuning though....Sometimes it takes a few tries to get the perfect sound out of them, no biggie if you know how to tune your drums properly though. Cool Dude