Hi Guys.

I have a 57 Bird with a 312 and a Fordomatic tranny. Holley 4160 465 CFM carb. I have a bog on acceleration from a stop position. I have new plugs, rotor and wires a year old. The car in idle runs smooth as silk. When I pull away from a light the car bogs and runs rough. Once up to speed it seems OK. If I punch it once at speed she takes off without hesitation. I have checked the front float level. Its right at the bottom of the sight hole. Gas trickles out when car is gently rocked. I had an issue late last year with advance plate sticking (slight rust) in an advanced position. I cleaned it up and lubricated it. It now moves smoothly in both directions. How stiff should the spring be? It takes a bit of effort to move it. I am wondering if the vacuum is strong enough to advance the plate. Vacuum reading is at 18.5 inches at idle in drive. I have advanced the distributor - car runs better but begins to ping and hard start when hot indicating to far advanced. If I retard a it bit it starts bogging again. Its such a fine line. This is cheating a bit - running it at advanced condition. Is the advance spring too tight? Is this something I can adjust without making it worse. My vacuum advance diaphragm is not leaking - I took it off and hooked up to my shop vac to test it. Carb air mixture screws are adjusted 1 1/2 turns out from closed position.



Any ideas?