Still can't get trustworthy running in the '71 MGB. We've checked the points, new plug wires, dismantled and cleaned the carbs including needles and adjusted by the Bentley book as best we can. Idle is rough (engine sorta shakes) unless we increase idle to about 1500. On acceleration (at standstill or under load) it hesitates and then backfires at about 3k - 3.5k rpm. We don't know what adjustment to make at this point. Help? Suggestions?