Just came back from my local Advance Auto store in Albany,NY and found a great deal. K+N oil filters for either a 68 350 or 430, didnt check other engines but most likely will fit, only 1.95 each. i ordered 10 but I know the roanoke,va distribution center had over a hundred on hand. the filter is discontinued but you can still order it through the store. Just looked at my receipt and I was wrong about the location of the distribution center it is actually Lehigh Valley I think that is in Penn maybe...
What is the K&N part number. Not sure about other stores but if you walk into our local Advance store and ask them for anything that old, all you're going to get is a blank stare so having a part number in hand would be very helpful.