Here's my brake booster and dual piston MC install.
I used this from Summit:
I ran all new Nickel/copper alloy hard line, front and back. Highly recommended, it bends and flairs very easily and will never rust.
I reused the old distribution block for the front and bought another one for the back. I put in a new pressure switch in the back line distribution block for the brake lights.
Mounting the combo could be a lot cleaner if you take the time to make brackets that look better. I got this idea from a picture I found on the net. They had used two pieces of square tubing to space the booster out, this does look cleaner. I used 4 short pieces to make it a little easier. Spacing out the booster is necessary because the booster push rod and the tube nut length is too long.
I cut the old push rod and welded it to a tube nut that fits on the new master cylinder and cut the old brackets off the old booster and mounted the new booster on them. Tube nut thread size is 3/8 X 24 for this application.
The 8" booster clears the shifter arm by about an inch. Everything else is factory.
Total cost was about $200.