low pedal

I have a 68 barracuda and it had a LBP manual system. My last 68 had power and when I sold it, the new owner wanted manual so I swapped it for him. That left me with a power setup sitting. This year I took the car out and one of the calipers stuck and it was enough of a ride from storage to the house to make the rotor questionable. I replaced the rotors, bearings, calipers, hoses and than swapped to the power master and booster. I had to put in new lines to the distribution block as well.

The lines run below the MC and have a loop on the way down to the distribution block.

When I started it the brake pedal sunk to the floor immediately so I knew I had air. I bought one of the motive forward bleeders that sit on top of the MC and wow the amount of air I had even after doing the vacuum pump method was a lot. I did this a couple times and believed I was free of air as I saw no bubbles. The pedal seemed okay before I started the car, but once I started it, the pedal went down some again. Not to the floor but some.

It was hard for the car to move in either direction without throttle so I know I have drag in the system. The pedal will work the brakes, but it is still not right.

I am ordering a new MC and will bench bleed it as I did the last one, but what other items might be my source for drag and low pedal?

Do I still have air or is the used MC likely my issue?