In response to bandit67 and this person's point if view, I offer the following comment.
If Bandit67, wants to maintain correct appearance and origionality, perhaps he could consider using an original Carter AFB carb such as noted above, as it works very well and is easy to tune. They are available thru eBay and other on line sources. The Edlebrock carbs (aka "Eddy's") are copies of the origional design but are adaptations, which sort of resemble the performance.
The Holley carb is a great product and as an alternative....but....you either love'm or hate'em....depending on one's understanding of how they work and ability.
The Holley 4150 R-3310-1 (and subsequently the R-3310-2) rated at 780 CFM is a great product. Subsequently the Holley 4160 R-3310-3, and later adaptations were rated at 750 CFM. Still a great design. However, the R-3310-1 carb has a hot air choke and may need to be converted to either an electrically choke coil or a manual choke, by using the Holley components to make the conversion. Personally, I've used the origional Holley 4150 R-3310-1 (with minor jetting changes) on both 383 and 440 engines with excellent drivability and performance with "reasonable" MPG.
The original Carter AVS carb is also an excellent choice, but not origional to the '67 440 engine. As noted previously, if origionality and appearance is the important consideration try to source a Carter AFB, if not buy what you like and can afford. Just my opinion of course.
BOB RENTON