Carburetors...are these the YF's

[LameHoof65]

I pulled these two carbs off of a couple of heads I pulled a couple years back, they have been sitting on the shelf ever since. What are they and can they be used for a dual carb setup on one of my heads? Just curious, when it is cold in the garage during the winter months I look for stuff I can monkey with---without leaving my heat lamps and space heater.

 

[powerband]

Here are two YF's. The one on the right is from a '71 Maverick 170. The one on the left I got on EzPay and want to ID . The carbs you have are either late model - gobbed with emission stuff or another application?.

Powerband