Thanks for the advice.
I purchased a new master cylinder, bench bled it per the instructions, installed it on the truck, rebled the entire system three times, no luck. Fluid comes out of all bleeders crystal clear and still no pedal.
In the Haynes manual and a few forums I have read that air can become trapped in the ABS block and the only way to bleed it out is by using a Specific Scan Tool.
The line that I replaced went from the ABS block to the rear brake hose... I had the line off all night so I am guessing the ABS block went dry and that air is now trapped in it.
I am having the truck towed to a local repair shop today to see if they can figure it out.