Midyear 55-up systems were all 12 volt, with resistors. The same coil was used all the way to the mid-1970s when HEI was introduced. Early 1970s ignition systems used a nickel-chrome resistance wire about 10 feet long between the ignition switch and the coil that doubled back on itself inside the wiring harness instead of a ceramic resistor- - - -same coil works from 55 to the mid-70s.

Buy one of Jon G's improved condensers, instead of the offshore made junk that's usually bad right out of the box.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!