There are two kinds of GM ignition parts- - - - -Delco-Remy and "WRONG". There are enough original equipment distributors on Ebay that I'd never even consider an offshore manufactured "clone". Get an OEM distributor and do whatever is necessary to put it in "as new" condition, using original equipment parts.

Or get an original equipment HEI.
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!