here's what I have: 68 400, comp cams 280ah-10 (.481 intake/exhaust),comp cams 1.65 ratio roller tip rockers, edelbrock performer intake, 650 holley 4150 dbl pumper with 71 jets in front/76 jets for the secondary's, 4-speed, non-a/c, msd billet distributor mech advance, 6-al ignition box, msd starter saver. right now I have the initial advance set at 18 degrees with the heavy silver & blue spring in with the black bushing. the firebird starts fine, idles fine...idles around 850-900 rpm with no issues. now, when I go to drive it & just give it minimal throttle it does fine. when I punch it, the engine revs with no problem, tires break loose, then it just dies. period. now, there's still electrical power but no "go". if I leave up on the throttle, then ease back into it, then I have power again. I just bought the holley last year, had it worked on by a tuning shop here because I thought it was the carb. the carb worked fine on their test engine in the shop after they finished it, no throttle loss at all when they gunned it. my guess is ignition timing? I just don't see this carb being to big for this engine set up. back off the initial? is it getting to much advance to quickly? anyone ever have this issue?
