[Terry,OH]

Looks very much like a Holley 94 style???? look to see if it is embossed with a "H, F
, 94 or other numbers and letters. There appears to be an open vacuum port?? Photos with the air cleaner on make it difficult to see much of the Carb. Is it a 2 barrel carb it appears to be since the intake manifold looks much like 1935 or 36 or other 2 barrel intake.
The two brass screws are the idle mixture adjustment. Adjust each at a warm idle for the highest and smoothest idle. each should be about 1 turn out or less.

If there is an open vacuum port make sure it is blocked before and after any adjustment.