need help with my 340

A good cam is a cam that works with your converter, gear ratio, carb and intake to make a good overall combonation in the performance area your looking to drive or race in.

Tell us the following:

Year
Make
Model weight
gear ratio
tire size
trans type

And what you want to do with the car

Include as well what parts you have on the car. Saying you have an Offy intake boils it down to approx 5 or 6 possible intakes Offy has produced. Be specific as to what you have and what you want the car to do.

We are not mind readers. Your question would have had me thinking race, since you said more out of it. So getcha self some 4,56 gears and the comp 308 cam, a 5500+ converter and let er rip!

All joking aside... Whatcha got goin on over there?