Goach,
The Carburetor Shop has an excellent tutorial on the Carter W-1:
http://www.thecarburetorshop.com/CarterChevroletW1.htmIt lists your carburetor as OEM on 1946 Chevies. I do my own carburetor rebuilding using NOS kits. From what I have read about "professional" rebuilders they commonly mix and match parts like jets and metering rods. Parts books list the correct metering rods and main jets for various carbs and verifying that those are correct is worth doing.
There is a linkage between the throttle shaft arm and the metering rod/accelerator pump bell crank. The bend in that linkage must be adjusted using a gauge that checks the distance between the bell crank and main jet orifice.
I have a fairly good stash of W-1 parts and the gauge if that would be helpful.
On my '36 Chevy PU engine I have a Carter Model 420S W-1 (1939-40 Chevy) with OEM 1937 Chevy main jet and metering rod. That works much better than the more primitive 1936 Chevy W-1 showing that mixing and matching can be a good thing if it's done properly.
