I think the philosophy behind handlebar height in the US in the 1970's was "Sit up and be proud" or something like that, because I look at old bike test reports from the era and there are pics of American testers riding shiny new bikes with "Ape Hanger-ish" bars.
In Europe and Oz, most of the CB750's were fitted with lower, narrower bars which were much more practical for high speed riding, although I still opted for a pair of flat "drag" bars on my (homely but reliable) new F1, when I fitted a bikini fairing, in 1978.
The issue that I'm (slowly) adressing here is that it's not gonna be a case of having cables long enough to suit the multi-adjustable Laverda Jota bars, but rather, you'll probably have way too much. There is nothing quite as silly as a bike with (urrrgggghhhh) "Slugman" bars, with miles of surplus cables looping ahead of the bike in all directions.
You can buy shorter cables (Sean Condon sent me a shorter clutch cable last year) and best you do if you want your bike to look and function as good as you'd like it to. Cheers, Terry.