As long as it bolts on securely, I don't see a major problem with using it. The degrees of advance might be slightly different, but it would be necessary to research that information using the distributor part number in a GM specification book. Chances are it won't make a noticeable difference.
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!