I have a 1960 Chevrolet pickup with the factory 4 wheel drum brakes. These pickups didn’t come with a brake booster just a firewall mounted reservoir. I put a vacuum booster on it to try and increase my braking power. I have bled and bled the lines and I cannot get fluid to the rear brakes.
Any suggestions or secret tips on what to do? I can’t get any “pedal” it just goes to the floor.
Any help will be greatly appreciated.

You say you put a booster on, was this a combo that came with a dual resevoir master cylinder? Did you bench bleed the master cylinder before installing the unit?
Easy test of the MC is to buy 2 plugs and screw them into the MC. If the pedal is rock hard MC is good and proceed down the line. If the pedal isn't rock hard the problem is in the MC either it's got air or it's bypassing internally.