dart gets a new holley

That's great 68gts340! There's nothing quite like romping the throttle on a well tuned V8! I hear a lot of complaints about Holleys and Demons, especially on some of the 4x4 sites that I frequent (jeez, just try to explain how to tune a Holley to a ham fisted 4x4 guy sometime! :scratch: That's why I hang out here :toothy7: Plus I plan on getting an A-Body soon), but with a little research and thought (like you did by checking your idle vacuum), these carbs run better than anything else I've found yet. I'm guessing there was a 6.5 power valve in there? Are you running a MP distributor?