Voltage at Coil Terminals - Help Please

[Bob Culver]

These topics can get protracted. The great virtue of old cars is that can safely and simply arrange a reasonable spark gap for one plug lead, and observe any spark or lack of. Avoid wide gaps which stress system. Possibly relevant,  on at least some distributor types the earthing of points to body is obscure. 
Testing at plug checks rotor etc.
Condensers are a puzzle and normally checked by substituion if feeble or no spark. Any traditional car type or cheap .2 mfd 400 v radio style can be wired externally to just test.