Standard air correctors are usually 1.80 for 44IDF. I don't know what normal size air correctors for 40 IDF. I'm guessing the venturi are 32mm in the 40 IDF, this seems correct for a 1915.
What sizes do you have? Do you also have a wideband O2 sensor and a suitable bung in your exhaust that will read all 4?
Idle jets could be anywhere between .50 and .60 size. There are 52.5, 55, and 57.5 in-between sizes available.
Mains could be 1.10 to 1.50, they are available in 0.05 increments.
It all depends on what the engine needs.
If it was me, I'd run it with the jetting already in the carbs to start, then change from that depending on O2 readings.