78 brakes

[78-5.3]

im installing my 3" spindles today and took off the cailpers i noticed while building my truck i didnt have any brake besides the rear which needed to be adjusted so i thought i would step on the pedal with just the front hose coming from the lines and not attached to the calipers and NO brake fuild comes out !! i have fuild to the rear but not the front i also removed the hydroboost from the truck and installed a 1984 booster and master i had some one step on the pedal while i cracked the lines to bleed the master a few times !!!
oh i should add that when i brought the truck it didnt have the engine in it and the brakes didnt work !!! i dont know if its the proposioning block in the front??????
is there something to check im sure if i stood on the brake pedal fuild should flow out!!!!!!