440 six pack high idle

I couldn't find any vacuum leaks, but that still doesn't mean there isn't one. I was watching it idle and pulled back the linkage on the rear outboard, and there was some travel left after the throttle was let off. So I extended that part of the linkage to "push" it closed, and shortened the front to "pull" it closed. I think that may have been a big part of the problem, because while the car still idles a little high, it's at least down to maybe 1200. (I really need to get that damn tach hooked up....) I'm going to keep playing with it, but since there's so much more to do to make it roadworthy - like rebuilding brakes - I might put this on the shelf and come back to it.

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To answer your question @413 , I don't have a stock distributor to use, and I'm running an MSD Blaster 2 coil. I out that on after running the stock coil it came with (same RPM issue).

I have also heard of warped bases on these carburetors mainly being caused from over tightening be careful of that. When problems like this arise tendency are to continue to tighten things resist that urge!
Yes! I've made that mistake before...