The P5 stuff is almost unobtanium, the reason you don't hear or see much about them. Blocks are almost non existent, heads if they are cast are basically sprinklers so you are kind of forced into billet for both anymore. The folks who have good blocks certainly wont let one go. I spent a fair amount of time at RWR and saw all that stuff first hand. Waters was part of the original development of the head for PST, he also was there doing them for Aussie Pro Stock until someone "stole" his customers. Now that RWR is gone its not important but Rick is a wealth of knowledge about the stuff. At one point he did most all of them. If they were available and out there one would find its way into a certain red car.