This fits 66-71 Quadrajet. 7/8 x 20 threads with 1" nut. Fuel fitting threads are 5/8 x 18. The threads are longer to grab deeper threads in your inlet, in case those towards the outer edge are stripped. May require tapping additional threads.
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I was a bit hesitant to order this part because if it didn’t work it would cause permanent damage. The item was shipped in a protected package and in pristine condition. It easily installed and works perfectly. Very pleased with the part as it works as advertised.