Ok here is where I'm at. I'm using Bill's (45APC) kit. It has been installed on my 75 with a 12 bolt rear axle. The kit works good and other than bleeding problems with the callipers mounted up top I'm super happy with the parts he is selling. I do however like the calipers up top and out of the way. The bleeding difficulty is just a work around and not really a big deal. I'm using 77 Eldorado calipers with parking brake. I still have the stock Proportion valve installed. For hoses I am using 79 Chevette front hoses and they have worked out pretty good. I was able to hook them dirrectly to the existing hard lines so no other modification was needed other than making a small bracket to mount the line on. Right now I am experiancing a soft peddle with excessive travel. Other than the possiblility of air still in the lines has anybody else found a possible cause for this. I would also like to hear (and see if you have pisctures) how people ar hooking up the caddie parking brake. I keep hearing all these problems with it but with my rea axle on jack stands and the truck in drive I was easily able to stop a spinning 35 with a 9/16 wrench on the stud. That leads me to believe that some of the problems people are having are installation related. So what works? Lets also hear some of your cure for the rear lock up problems. I would really like to hear if anybody has tried Inline tub's Disc/Disc Proportioning valve and what they experianced with it.