Have some questions.

whitey said
Thanks for the input guys....I've gotten alot of advice from alot of guys. I've been doing some looking around...

I went to the buyers guide for mopar crate engines, it states that for THESE engines, Mopar recommends a 750 Holley, but the only thing the crate engines has in common with mine is the Magnum heads.
I went to holley.com and ran through their interactive carb selector, and the Street Avenger carb that came up was the 770 w/ vacuum secd's.
I went back to the one book I bought, "How to Hot Rod Small Block Mopar engines", Chapter 13, pg 178, under carb selection, it states for a 360 for performance/racing applications to use a 750 CFM.
When I go through the equation: CFM= (RPM x CID)/3456, I get 6500 x 365/ 3456 I get 686.4873.

so it seems I can go either way, go 670 and fattening it, or 770 and leaning it back. Am I right? If so which wouldbe better?

Whitey, keep in mind that you are comparing a crate motor that uses a 288-292 duration .501"-.513" cam. This is much more than the 340 spec cam you are planning to use. The Mopar crate designates 750cfm with the larger cam and 1.92 or 2.02 intake valves to achieve estimated HP between 380HP-395HP. Taylor your expectations with a smaller cam. The Avenger 670 or 750 cfm is a good carb to use with the 340 spec cam. You can even step up to a Comp Cams XE262 or XE268 and still be ok. But anything over 750 would be too much unless you start camming deep into the .500" range...and then you will have other things to plan for.