What did I Buy? (Carb ID help)

Looks like the Carter YF. Also looks like it's missing the choke cover, which is going to make starting adjustments tough...
I had figured it for a YF . I'm looking to verify size, cfm or engine it's for. I may rig up a manual choke for the time being as that is what i've had on the old 1100 that's coming out. I may just experiment with this one and if it gets rid of idle problems etc - go for one in better condition.