Being a bit of a carter guy I'll pass on that the carters were very, very specific about the carburetors they made for your engine. Try to find an original designed for that engine and then rebuild it - get the carter spec sheet and follow it.
I had no idea carter was so precise until I started to buy up old inventories - they were manic about them.
What IH carb, a tillotson or zenith? is that what they used? I've always had deep respect for the IH carbs but never did one from late 40's
