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I've got a 84 f-150/I6-w/Offy DP. The carb I got is 64-5346 (early 70's P.U. w/302 as far as I know).
In the kit instructions they have the "adjustment data table" for 70-74 302's on a P.U.
That carb and adapter aren't going to work worth a flip on a DP. At the very least you need to find a way to put that 2v over the primary openings and just block off the secondary passages.