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You'd think a carb designed directly after the original Carter AVS would clear a factory intake, wouldn't you?Actualy, a 600 AFB came stock on early 440's. My old friends 67 Imperial w/a 440 had a 600 AFB on top. The early versions of that carb had no secondary air door, FWIW.
But I do agree a 750 would be better on top of this mill.
To the OP, would the carb clear with the thick Edelbrock carb gasket at approx. .333 thick? That spacer you have now is requiring you to have more pump shot to be needed. And not helping much for fuel distribution into the intake. The fuel is just crashing and probably pooling a little bit on top of it.
Turns out, not so much. The choke well in the stock intake is the culprit, as much so horizontally as vertically. One could grind off some of that well wall, I suppose, but I chose not to since I had a Holley 750 vacsec on it before and the same issue reared its' ugly head.
Speaking of the venerable Holley 3310 750cfm, I had numerous times in the past slapped one of those on stock or near-stock 440s right out of the box and they were golden. Adjust idle mixture and go, pretty much.
Not this time, even after multiple jet and power valve changes (see previous postings). Stumped me on that one. Sold the carb to a fellow member here, still as new in the factory box...
I do make the effort with the carb spacer to get a good quality one and a true "4 hole" one that matches the 4 runners in the intake exactly, as opposed to the "one big hole" spacers out there. I know that much matters, for exactly the reasons you state.
Again, nothing new for me. Did the same all these years with the aforementioned Holley, never had an issue.