No unitized distributors were factory installed on 1971 models.
1112072 is for all 1971 455's, except HO.
1112073 is for all 1971 455HO engines.
Both are breaker point distributors.
EDIT
After referring to Rocky's HPP article, obviously I'm mistaken about no unitized distributors being installed in 1971 Pontiacs.
Interesting that Pontiac changed the engine stamp code from "YC" to "YA", yet the distributor stamp # remained 1112072!
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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