I've used them successfully on the HEI distributors I modified for round track racing. Class rules for the division we ran prohibited using an aftermarket ignition system like Accell, Mallory, MSD, etc. The engine had to be "stock appearing". In racer-speak that means "Cheat all you want, just keep it hidden!" We drove Melling high volume oil pumps at 6K+ engine RPM and 50 PSI oil pressure, with bronze distributor gears and roll pins like the one I posted- - - - -with no failures!
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!