oh your geting into basic tuneing. it depends on what carb you have right now. the easyest way to adjust the idle mixture is to use a vacuum gage and a tachometer. hook the vac. gage to a manifold vacuum, the tach. to the igniton and start the motor. the idle mixture adjustment screws are in the base of the carb, either on the front of it or on the sides depending on what carb. sence you know its rich already screw the screws in 1 turn. now the idle speed should have changed. if it went up your geting closer to where you need to be. if it drops then the screws were turned in to far. readjust the idle speed to around 800 rpm. now make only 1/4 turn adjustments on the idle mixture screw. pay attention to the vac gage. you want it to pull the most vacuum possible. adjust one screw alittle bit then the other. once you get to the point that any adjustment makes the vac drop your there.
It made a seat of the pants difference in the 351w and the 460 I did it to. If it needs changing and his looks like there is slack on both side I would go with a roller set up that is set up with the 3 keyways or at least for a 69 302 since it should'nt have the retard built into clint
Third is the initial timing. If it's set to the factory spec of 6*BTDC, there's your problem. Advance it to 12* and the stumble will disappear.
Damn you guys rock now I need to geta timing gun and play around with this old betsy! Should I have it at a certain rpm when I set timing? Thanks
You'll want it idling in gear as low as possible where it won't stall. Set the idle, then the timing, then go back and lower the idle, as that will go up when you advance the timing. Set the timing and idle without it in gear.
