Re: 1972 LT-1 Carburator
Per Colvin's book, Holley says you won't see any "A" characters actually stamped on a carburetor as a suffix to the LIST number - only in the paper listings. They suffixed the stamped LIST number with -1, -2, -3, etc. to indicate changes in a production design (like the 2818 for '64, and the 2818-1 for 1965 as shown below).
Per Colvin's book, Holley says you won't see any "A" characters actually stamped on a carburetor as a suffix to the LIST number - only in the paper listings. They suffixed the stamped LIST number with -1, -2, -3, etc. to indicate changes in a production design (like the 2818 for '64, and the 2818-1 for 1965 as shown below).
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