Here's the deal, I have an edelbrock performer manifold and 600 cfm carb /w manual choke on my old '66 project that I have pretty much abandoned. I have considered swapping it onto my burban's 350, but I hate to loose the automatic choke that is so convienent on the burban. How much cfm did stock carbs on the '78 350s push? I really hate to tamper with the burban because its so reliable, and if it ain't broke don't fix it. So how much power would I gain by swapping in the edelbrock goodies, and is it worth it. I have also considered swapping in my old flowtech headers, but I really hate the idea of transmission linkage clearance issues that I could run into, after fitting them in the old '66, I swore that I would never fool with headers again. So again, how much power, and is it worth the trouble?