Thanks guys. My truck is a little different, it's a 55.2 on a '78 blazer frame with the blazer rear end. The wheel cylinders were replaced last year along with new bleeder screws. I've inspected the lines and they show some rust, which worries me, but I'm not sure I can find replacements as the lines look custom. Assuming I don't break and lines when I install the master cylinder, I will probably take the truck to a brake shop and have them make news lines.
