Brake help!

[RThree]

I have been getting my 72 Longhorn ready for C10 Intervention when i noticed some brake fluid leaking from my rear drum brakes. Opened them up and found that the Brake Cylinders were leaking on both sides. I ran down to the parts store and found a new set and got them installed.

This truck has Disc Brakes front and Drum rear and everything worked fine before i started this peddle might have been just a little squishy.

Since replacing the brake cylinders i have had a hell of a time bleeding them. I found out about the Metering valve and made sure that it was recenter and that the dummy light went out and then tried bleeding again. one side bleed pretty well, the other side still only a trickle but i thought i had it bleed. Started the truck and one step on the peddle it went right to the floor dummy brake light comes on and were back to square one.

When we are bleading it the top half of the peddle has near no resistance but the bottom half feels stiff.

what am i missing, the system remained full the whole time we may have got a couple air pockets but im pretty sure i bleed them out. i feel like this should be easy but im lost.

Please help the time crunch is real.

Thank you for reading any help is welcome.