Carb spacer query

#'s 3 and 4 cylinders are always the leanest on mopars I think that it is to do with how the intakes fuel distribution is along with the cams firing order, chevys have similar problems as there firing order is the same. I took a team G intake and moved the carb 1/2" forward by machining and rewelding a spacer to it and seemed to help this problem greatly. And didn't have anymore leaness on #3 and 4 cylinders.