66 valiant no start

Maybe I got off track here..........do you have good spark or no? All this may be a waste of time "if you do." The "path" through the coil is this: Power to ballast resistor from the key, should be "battery" (same as battery)---through ballast with points closed about 6-10 either other end of ballast or coil POS and coil NEG should be very low. If you are showing such at POS coil and nearly zero at NEG then the whole thing is drawing current through the points as it should.

If the points are making / breaking OK and drawing current, and you have changed the coil I recall, the condenser is all that is left.

You can simplify it further by eliminating ballast/ wiring---jumper power to coil + and with points "bumped" open short the coil NEG to ground either at coil or at points terminal in distributor. Should make a "snap" spark out of coil each time. If not, its either coil or condenser