The 429 is still not running right. I have installed a Qjet that runs fairly well but is hard to keep running when it is cold. The idle speeds up as the engine warms up. It will run fairly smooth when warm but when I give it gas it misses and has a bad afterfire. I have a resently installed pertronix ignition. I checked the valve timing and the vibration damper has not slipped and shows TDC when the valves at shut. Timing is set at 8 BTDC. I can't find a timed vacuum on the carb. I talked to a carb specialist and he told me which ports should be timed. Neither one was so I have vacuum on the vacuum advance at idle. I can't figure why I would have vacuum on a timed port. I believe that might be causing the afterfire and the pour idle. Any help would be greatly appreciated.