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PwrWgnDrvr
383 was not std ever! Whoever said that doesn't know jack about these trucks!
"The D Series was redesigned in spring of 1965, hence there are both two-headlight and four-headlight models titled as 1965's. Updates for mid-65 included a wider tailgate and the replacement of the A series engines with the updated LA series.
In 1967, the D Series trucks received big-block 383 2-barrel engines as a standard option."
.........stupid Wikipedia
I thought it sounded a bit off