What application for crank pulley #3814378

Going just by the part number, no. The number may have been superceded though. The original part number for a '70 340 with P/S, but, w/o A/C is 2946789. It would have one offset mounting bolt hole. Starting in '72, they went to an evenly staggered bolt pattern.......and I'm sure a new part number. Being that late a number, I'm sure that would have the even pattern too. You can use either type by slotting that one hole.