340 intake/carburetor advice

What gears are you going to run and are you using an automatic or a four speed? It doesn't really matter here other than to go ahead and invest in a good torque converter if your using an automatic. For a mostly street driver you will be hard pressed to find a better cruising combination than an Edelbrock air gap and an Edelbrock AVS2 800. If your more all out performance oriented then use an 800cfm or larger double pumper.