So.............

Take off the air cleaner, and look at the carburetor from on top of it, openr all the flaps (if there are any). How many venturis (holes)do you see? It will either be two or four.
So now you know if you have a two barrell or a 4 barrell.

Lets work on make next.

Part numbers for all autolite/motorcraft carbs will have be stamped into the drivers side front foot.
That part number will id the particular carb.

What type of vehicle is it installed on?

Hope that helps,

Bill White
White Automotive