Not sure about all Weber DCOE's but mine (made in Italy) were ball bearing shafts & were sealed, great for blow through apps.
I would go with the Webers if you can.
I would get a book on Webers & do some research for the ones that would work best for you.
The more transitioning holes, (holes in the bores close to the throttle valves) the more the better, smoother, better drivability.
IIRC, my 48 MM carbs were made for a spec class of racing & only had 3 transitioning holes in the bores, had more of a on throttle off throttle feel, not so smooth, but I got used to it.
MBHD
