I worked on my friend's similar vintage V45 Magna, I'd rather do two VMaxes rather than 1 V45 carburetors set. Two guys who worked on fire-rescue with me bought brand-new V45 Magnas when they came out, I was riding a DOHC CB750F at the time, another guy had a KZ750 standard, and they were all close to one another in performance.
If the bike has no issues after the restoration of a functional induction system, someone should be happy. I wouldn't just throw someone's work on the bike though, I'd go through them myself, to ensure things are correct, and to lessen the chances of having to remove 'em and and to tear 'em down, fix the botched work, and then remount 'em.