Thanks Devin! Unfortunately the junkyard here is ecology and they dont have the hollander manual. I was definitely planning on going with the dual chamber one but one thing that I have been curious about is that I have seen other 64 C10 with the power master cylinder setup and the bracket that holds it to the firewall is huge! in the sense that it appears to keep it about 7 inches from the firewall, I have been wondering why that is.