problem with dual point no spark

Bear in mind that distributor drive tangs are not all the same relative to the rotor. So the thing may be out of time.

^^As above the popping may be the dist is 1/2 turn (180 out) off

So far as no spark, hook the thing up on the bench, ohmeter from distributor primary wire to the case. With the cap off slowly rotate and see if resistance goes from a very low value to infinity. If not block one set of points open at a time (light cardboard or even paper) and see if one is not opening. Maybe neither is, LOL. Look for shorts in the terminals of the points, condenser, and jumper wire. If all else fails disconnect the wiring, and check each set of points individually. All they are is a "switch to ground."

it might be the condenser is bad or shorted.