[T77911S]

JERRYL and JW have given you good advice. start with the basics. when setting up carbs, disconnect the linkage to both carbs to make sure they are effecting the idle.
either you have the air bypass screws set too high or the linkage is effecting it. if you have a vacuum retard on the dizzy, check to see if that has come off or check for a lose dizzy.

i always start (like after a rebuild) with the air bypass screws all the way in. this is of course after timing has been set. dwell is not a big deal with these ignition systems, dont nit pick over it. use a feeler gage and your done.

once i have it so the car runs, you may want to leave the linkage connected until it is running, i check the vacuum on all 6. i note which ones have the highest on each side. then i adjust the 2 on one side up to the high on that side. then i adjust the 2 on the other side up to the high on that side. at this point, the 2 sides will be different. then i balance the idles. then i go back and repeat the process again. then i will go through them again and make minor adjustments until they are all the same.

after you are done with the carbs, connect the linkage. i had a way to adjust mine so it simulated my foot holding the RPM's up to around 12-1500. you will need to keep it low so the sync does not peg. now you need to adjust the linkage to the carbs so that both sides have the same vacuum. if it does not return to the idle you had before connecting the linkage, you have the linkage too tight. losen it up until it idles and repeat, you may have to adjust one side down to the other.

replace plugs, they are likey fouled after all the adjusting.