So just some clarification on the 500 end carbs ... I also have a 340 Six-Pack set up .. looking for some spare ends 500 carbs original parts numbers are 0-4790 rear and 0-4789 front .. found both but between the price to buy and restore is crazy.. so I purchased a new center from Holley 0-4792 350 CFM .. I see they no longer remanufacture the end 500 carbs for the 340.. so I have been looking at the 500 CFM carbs for the 440 engine 69/70 Holley 0-4365 and the 1971 440 engine 0-4672 .. I've been told the 69/70 has a different style metering plate and the 71 has the same style metering plate that my 340 end carbs have in them just a different jet size. Question will either of the 440 end carbs work on my modified 340 ? and if so should I go with the 69/70 or the 71 carbs? any help would be greatly appreciated from anyone who has dealt with this scenario. Thanks