68' DART BRAKE WOES

Thought I was home free with new brake m/c on all wheels, new brake pads front and rear, rebuilt power booster from KARPs, reset power brake push rod to spec per FSB, bleed brakes, nice and firm pedal, stated car and WOW....pedal goes to floor. What is going on, wifey says "sell it".

Original brake pedal rod in use, do I need a special one for the power booster from the pedal? 9 in drum brakes on all 4 wheels, 1 in bore rebuilt M/C and no air bubbles when bench bleed. M/C totally filled, engine is OFF and slow pedal push and geyser with "air bubbles" (i don't think this is right!) in M/C front and rear reservoirs....dah!!!!!.

Need some help. Where do I start?

Thx MOPAR geeks. UR the best.