75 Duster new brake pads won't fit

Good news and bad news-the new brake pads fit and the rotors will spin now. But, the brakes don't stop well now. And when I step on the gas, I really have to hammer it for it to move. Not sure what's going on here. I did adjust the front band to 72" and backed off 2 & 1/2 turns. Does that need to be turned out more? All the brake parts are new. I did rebuild the 727 trans.I put new clutch packs in it and a transgo shift kit is in it. Is there something else I should be looking for? I can't take it for a spin around the block yet, since I don't have a plate on it. That's next on my list. Any advice would be appreciated at this point.