I am having brake issue on my 1970 duster

I am having brake issue on my 1970 duster

So it was a power brake car we did bench bleed to new master cylinder it came with the new vacuum booster. We bled all the brake lines and adjusted the rear brake pads
disc front drum rear it will stop if you are going slow but takes at least 60 ft to stop at 35 mph. The car was stopping ok last year put it up for the winter and the brakes
were marginal when we started it up this spring so I ordered new master and vacuum booster. installed them and still now working right
thanks for all the help we live in snow country so just now getting nice enough to take it out.