The Carter is set up for the "AFB" flange configuration, with 2 additional holes in the "Holley" configuration. The flange is plenty large to mill 2 additional holes so it will fit the "Holley" configuration. Have seen many of them that have been modified with the extra 2 holes (total of 8).
The issue with the 9400 is that Carter made the last one about 1980; they are very much in demand, and fairly pricey.
Jon.
I think I have one of these 9400's. I took it off my truck because it lost adjustment nearly weekly, drove me nuts. I was a quick starter, though, even after sitting a few days or even when the weather was cold the engine would fire up immediately with a tap of the key.
Edit: The Carter was on a 305-307-350, I don't think it's a 350 because the engine is a dog, but it did lose adjustment quickly, and I don't know why unless they are prone to losing adjustment like that.
