That's a 1963-up 6 cylinder distributor for a 230/250/292, etc. I convert the regular stovebolt items to use an HEI trigger setup- - - -the ones where the vacuum advance rotates the whole housing.
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!