Good Afternoon FCBO, I was replacing my radiator in my 67' 300 today and I decided to pull off a valve cover and see what the casting numbers on my heads were. I was hoping for the 915 closed chamber heads but that is not what I found. Instead I found the numbers 2406518. I had never seen those numbers before so I had to look them up. Well after extensive research I found out that the heads are from a 426 Max Wedge. Apparently they are the later stage 3 castings. They have all the correct markings and rocker towers. So I went to Ebay to see if I could find a pair for sale and I couldn't find any. Can any of the guru's on here give me an idea of what these things are worth? I don't believe they have any cracks in them and they are in good shape. Thanks for looking.