Help identifying correct year for this harness

I am clearing some of the duplicates I have accumulated. One of the 3 was labeled as a 74 DART w/AC, but it looks slightly different than the harness in my 74 Dart. The other(s) appears to be older but not marked. Looks like fuse block on one of them was on backside of the bulkhead, not like later when it was on the kick panels. Ideas regarding correct year (range) by looking at fuse blocks?

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