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Ok....I know what an AC R44t plug is, and why one might be found in a 454.
But looking over my 1978 dated build sheet (LS6 crate motor install) for the 454 in my '73 I'm seeing a "J44t". I have no recollection (the car was basically stored in the 90s, and some of the 80s and 2000s) what a J44t is and I can't seem to find it doing searches. They are not in the car now.