custom ecu without itbs?

You need an ecu capable of mapping off a throttle pot for itb`s, the pug ones (magnetti marreli?) do this as a fallback to the map sensor wich you can`t use on itb`s easily.

With itb`s you get 4 trottle bodies all their butterflies are connected to 1 spindle which the trottle pot reads, other than synchronising them for idle (balancing) they all work together.

I think most ecu`s will fuekl all the cylinders the same, some may allow individual adjustment but barring an o2 sensor bolted to all 4 of the exhaust outlets I don`t think you`d need individual cylinder fueling?