You need Rochester "small carbs". They will have 1 3/32" cast on the inside of the venturi body. You also want to pick carbs with the gas line entering the "side of the carb top". They made many variations of this carb over 30 or more years for many different applications. The different numbers 2g, 2gc, etc is for the different types of choke linkage. Try to find three carbs that look-a-like with the same linkage. Lokar makes a nice throttle cable stop for the rear carb. I have found that you need about 4 to 5 "swap meet" carbs to make one "good carb".