Holley 870 Strret Avenger Carb

WAY too big for a 340. The 800cfm Thermoquad has primaries about 1/2 the size of the 870. That means what you normally drive around on, will have a very weak signal. I use them on 4" arm engines and they are an excellent carb. But they are wet flow tested and rated. The Thermoquad, rated at 800cfm dry, ends up really being about 750 when wet flowed the same way. If you are looking for a great balanced carb, the Street Avenger 670 would be my first choice.