Interesting drum brake problem

I got a 72 Duster a few months back, but due to 2 feet of snow haven't been able to get anything done. I want to get this car to the point of a summer daily, but one problem is holding me back.

The ***king brakes on this thing.

The master cylinder was replaced by the previous owner, and it looks like the lines are new too, so no worries there. I'm working on setting the correct pressure on the front shoes, and on the back, the right side is fine, but the left side keeps dragging even though i've taken the drum off, and cleaned the hell out of it. I set the brake just to where it starts to drag, but it locks every time I touch the brakes, and usually ends up smoking. Also, I get a brake light intermittently and it feels like I don't have the pressure I should, or going on my 69 Valiant, it feels like I should have a lot more pressure instead of locking the brakes when the pedal hits full travel. It doesn't go to the floor, do they need to be bled?

Not really in a hurry but I need to get exhaust run on it soon.