This is a setup I'm in the middle of putting together for a 440.I've used a 650 for the centre carb and a pair of 350s for the outboard carbs.I'll be making up progressive mechanical linkages and I'll have to build a custom air cleaner.
And for a bit of nostalgia here's a 6 pack setup I ran some 25 yrs ago.
Triple 45DCOE webers.