I'm still trying to decide on a carb. I had my mind made up on a Street avenger 670 but they're asking almost $400 here, but they had a Holley 600 for 260. Right now my 350 is mostly stock, but in the future I plan on putting in a different cam, a Holley Street Dominator intake, dual exhaust, and maybe getting my 305 heads reworked and ported. Would a 600 cfm carb be too small or should i go up to the 670 or bigger?