Originally Posted by 85 k5 mud truck
inside the left bowl there should be 2 jet that screw in. might be on bowl side bowls on your carb, go to advanced and order like 2 sizes above yours, in increaments of 5, switch them out about 10 more then what you have stock, that should fix your lean problem
There couldn't be any worse advice than this
. Main jetting has nothing to do with idle rich/lean conditions.
Are you familiar enough with the Holley to know what your transfer slot to throttle blade relationship/setting is now? This goes along with what Mike said in the previous post, may need to drill the primary blades if you have the throttle too far open and too much transfer slot is exposed.