But a C4AF-DJ (as this is the only 4100 with the DJ designation so I am assuming you just left off the C4) would be applicable to a 1964 mercury 390 with auto tranny. As far as the carb kit that is even easier. ALL 4100 autolite carbs use a motorcraft CT-191A available either from your local Motorcraft dealer (FORD dealer) or from online parts store. Its really the best kit out there in my opinion.
Bill White
White Automotive
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HAVE A NICE DAY!!!!