The Holley model 1970 is an aluminum updraft carburetor used on Allis-Chalmers and Ford tractors and industrial applications from the mid-1960s into the late 1970s.
The carb number is stamped on the side of the float bowl. Holley carburetor numbers are discussed here.
Holley Model 859 updrafts were used on 1949-1953 Ford trucks.