Barely any Brakes

I have a 1970 Dart 340 with manual drums all around. 8 3/4 SBP.

I finally finished my 340 build and got the cam broke in. I bled all the brakes and the pedal is easy to push but has very very little braking force.

I can put the car in reverse and it will slowly roll back while at idlewith the brakes to the floor! The car will eventually stop, but it takes some serious pedal travel.

I was getting fluid to each drum, when I bled the brakes and I'm sure I got all the air out of the lines.

Each wheel cylinder, shoe, drums looked good. I'm leaning towards the MC needing to be replaced.

Just needed some advice. Thoughts?

Thanks.