Turn the key to run. Hold the coil HT wire near ground. Separate the distributor connector, and take up the vehicle side (not the dist end). "Tap" the bare connector terminal to ground. You should get one spark "snap" each time
I don't think I ever saw if this method was used to check the ignition box (or if it was just by the key being turned off)
Take a look at this and please verify the locations are correct on your distributor.
Ignore the fact that it is a dual pickup, as I just need to verify the roll pin and markings on the reluctor are in the right orientation.
Sorry I didn't realize this was one of my advance modded distributors or I would have commented sooner. EDIT: Also know that the distributor is set up for a min 14 degree intial advance and 18 more on the limiter plate for an approximate 32 degree total without vacuum added yet.
And that the orientation of the shaft end is probably because in remanufacturing they may have turned the pinned retainer on the shaft 90 degrees and drilled a new hole for that roll pin (seen it before) but it makes zero difference in the function of the distributor (you just change the wires to match like you already did)