Original List 3259 715 from a 65 has different metering blocks than the List 3259-1 and issues. But, gaskets are identical. I have a reissue and found one of the two asked positioning posts was a bit long and was not allowing block to sit perfectly flat which allows gas everywhere...Remove gaslket, put plate against main body and see if it is flat or rocks. If it rocks, zero in on the pins. I had to file bit off mine to get block to sit flush. Originally thought I had warpage issue...Get known straight edge and put it on Bloch surface ce and see if light shows thru. Same for main body. I found one squirter that when squegded in, created a lit that may have caused a high spot. Small file and patience fixed both issues. I get my gaskets from Jarold at AllState carbs. allcarbs.com. They know List 3259 carbs