Help with brakes.

O.K. folks. Need your help again. The PO told me he had replaced all 4-wheel cylinders, brake shoes (drum brakes all around) and replaced the brake booster and master cylinder. The guy that delivered the car didn't say anything about the brakes. When I first got in the car, no pedal. Goes all the way to the floor. After trying to bleed the brakes all around, still no pedal. After checking with the paperwork from summit, it looks as though he ordered a booster/master cylinder for a 1966 mustang. This is the number that's on the paperwork (SUM-760227). I've already ordered the correct stuff for my Dart. Just wanting to make sure why it won't build brake pressure. I swear, I would never ever let a car go with bad brakes or any safety problems. Pic of booster/ master cylinder he purchased. Also, while bleeding, passenger front and rear bled out fine. Both on drivers side continued to produce air bubbles. as if I had a leak somewhere.

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