Thanks for the info. Could you quote me a $ for the 7011600? I will pass along the info on the idle circuit size. Thankfully, the rebuilder I am using is not a big commercial shop. He is in TX and focuses on the Quadrajets, but he has done work for me in the past on other carbs and they have turned out great. Shipping sucks, but my day job rarely lets me get out to drop off carbs and other things to local shops...so it's just as easy to drop it in the mail to me.