What is the difference between all the A body gas caps????

cudamark said

Here in Ca. there was an early '70 cap (before 1/1/70) and a late '70 cap which was like the '71.

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There are two '70 caps. Difference is not early vs. late, it is with vs. without evaporative emission control system, which was required in California for '70, rest of USA for '71. The '70 California cap is same as the 50-state/Canada early '71 cap. The late '71 50-state/Canada cap is same as the '72-'76 cap.