I used the Offroad Design bracket kit with the rotors, calipers & pads from a GM corporate 10 bolt, 3/4 ton for the 8x6.5 bolt pattern. Also used factory front rubber lines, and welded a large washer to the top spring plate to mount the frame end of the line to. This allows the calipers to move, you cant use hard line directly to the caliper. Only thing is you lose your park brake. You may want to contact R1 Concepts under the "Vendor" section here at the forum for calipers that have provisions for your park brake, hopefully they are better than the old Cadillac El Dorado ratcheting calipers w/park brake levers. Oh also you may want to pick up an adjustible proportion valve. The rear brakes may grab a lot harder after the swap than your drums so you may want to cut a little pressure from them. I picked one up from Jegs for around $20-$30. Also I read with the longer throw of the caliper pistons compared to the wheel cylinders you may have issues of the rear reservoir going drastically low once the pads wear but I haven't experienced that yet. I think the fix was use a 1-ton master cylinder but you already have that.
