hesitation with my 340

freshly rebuilt 340, holley street avenger, orange box,and 2 wire ditributor. stock 6 cyl coil and voltage regulator. problem occurs when i am at crusing speed and "floor it" the motor spits and studders then takes off like a bat out of hell. i am almostpositve it isn't detonation,i pulled myplugs they were normal. i realized that my vacum advance was disconected i hooked it back up and the problem was still there it just didn't seem as bad. however my last run with the car ihad the head lights on and when it spits and studders it seemed like the lights went dim. any advice?
Author: admin