Bart.....the economy 2bbl did not have the big idle air adjustment screw at the rear of the carb. The choke housing was mounted up on the side of the air horn. The standard (large) 2bbl had the choke housing mounted down at the throttle body. The economy 2bbl had it's own intake manifold machined specifically for it's smaller bores and stud pattern. It is correct that the throttle body, fuel bowl, and air horn of the economy 2bbl are the same as the 59-65 Tri-Power center carb. Your pictures appear to be the standard 2bbl......John
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