Half of block not firing

FIRST thing you need to do....and I'm repeating..........is find out what cylinders are missing. If this is truly one SIDE, it is likely a physical vacuum leak at the head. If it is (dual plane) missing every other cylinder in rotation, then it is likely a carb problem, or a leak into "that side" of the intake.

This is WHY both OldManMopar and myself asked you what kind of intake. "The problems are different"