[CSHADES]

Speaking from the street rod side of things go with the Vintage air setup. Southern rod parts has some cheesy products at times and you never know exactly what you are going to get in my past experiences. As far as the heater hose/ac lines, install a bulkhead on the firewall instead of running the lines through the firewall. It will look better and be a bit easier as far repair work later on. As far as hiding the master under the dash or under the truck, I have a couple of cars with the master under the vehicle, it is a pita to deal with at times and you will have to use a generic pedal setup and fit it to your truck. You also will have to add residual valves in line to keep the air from entering the wheel cylinders and calipers. Hiding the master under the dash sounds like a good idea if you can bend well enough to add fluid with out spilling it all over your carpet and you should think about how much room under the dash one of those setups take up. I have built a lot of cars in the last 40 years and sometimes what sounds cool ends up being one of the worst ideas. Just my 2 cents, it is your truck do what you want.