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Maybe try Carburator Specilists in Atlanta.
A company I used to work with put Edeldebrock's on them, maybe 650's. They hired morons and those 370-429 held in there unbeleivably well with no goveror.
If any one does need a carb I have a rebuilt one from a 1977 f700 that was a governed engine. I believe it is 4150G Holley 4bbl. I realize this is a ancient post but you never know who can't find one.