Type of carburetor

Good afternoon friends !!! My query is that I have a cologne motor 171 V6 carburado, he comes with a 5,000 rpm cam but I just bought a 7,000 rpm cam, I will carry cameras and rectify the block at 0.40 (I do not know the measurement in millimeters) but I am in doubt what type of carburetor we use if one of 450 cfm or 600 cfm. Someone who took me out of doubt. greeting.

Look as Formula should be the 450cfm

Put the greatest because if the cam is a lot of crossing and permanence, you have to throw gas, the greatest you can shrink the wardrobators to the smallest for more than enlarges will not give you as the big one, what if you are going to have to put a good on of competition since it takes to burn that fuel that fuel

Thank you friends, they got a 600 cfm I ​​will try that to see how and I tell you. greetings.