What care are you thinking of putting round slides on? Back in the 1970s I thought about putting eight 44mm on a small block chevy. Never did it though , I just stuck with a tunnel ram and two 600cfm hollys. The Mikuni's would work better than four webers since each carb could be calibrated for each cylinder rather than done in pairs by changing air bleeds to meet each cylinders needs . Plus a manifold with a plenum works better anyway , with a broader power band.
Rich
Rich