Pertronix models and notes 216/235/261 (2015 catalog)Different model numbers for 6v and 12v (and for GMC positive ground 6v)
There are not longer 2 model numbers for: 1953 and earlier distributor (low distributor cap and older coil-lead post on distributor); and, 1954-1962 (high distributor cap and newer coil-lead post on the distributor).
The excluded distributor in Footnote 36 is referring to the special 1953-55 Corvette distributors on 235 engines.
Heed Footnote 79 "Not for use with solid core ignition wires."