Quote: 500 cubes/stealth heads & it ain't been right since day 1 with the massive intake leak. With a killer eng like this you're gonna have a smile on your face once you get it sealed up/tuned
You think OP, once you get the intake sealed up try setting the outboard linkage up on the center carb. by screwing each end rod out longer than needed to insert it into the linkage on the center carb. Then adjust each one of those so they just fit with the outboard throttle shafts closed all the way with the idle speed screw on the center carb. backed out all the way, adjust from there One other thing is to check the idle mixture screws on the outboard carbs, remove the lead plugs if neccesary and adjust them in all the way carefully,do not FORCE THEM in ,then adjust them out 1/4 to 1/2 turn each on both sides. set the center carb. mixture screws from 1 1/2 to 2 full turns out from bottoming out also, then set the idle speed off of the center carb. My last six pak idled at 850 RPM in gear with a lot bigger cam than yours, it took some tuning to do that also You can make it work good also
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
OP, once you get the intake sealed up try setting the outboard linkage up on the center carb. by screwing each end rod out longer than needed to insert it into the linkage on the center carb. Then adjust each one of those so they just fit with the outboard throttle shafts closed all the way with the idle speed screw on the center carb. backed out all the way, adjust from there 
One other thing is to check the idle mixture screws on the outboard carbs, remove the lead plugs if neccesary and adjust them in all the way carefully,do not FORCE THEM in 
,then adjust them out 1/4 to 1/2 turn each on both sides. set the center carb. mixture screws from 1 1/2 to 2 full turns out from bottoming out also, then set the idle speed off of the center carb. 
You can make it work good also 