Holley 2-bbl on 273

This engine is the two barrel 64 273. just looking at the carb. on this thing, and thinking that the carb. on my lawn tractor is bigger. I have a Holley 350 cfm carb. that was originally on my other Dart with the 6=8 Clifford package. The package came with a four barrel, but the PO changed it out to a two barrel because he thought that the four was too much. So he gave me the four barrel also, when I bought the car from him.