383 dual quads lean at idle and cruise

I dont know them very well first hand, but some of those early dual quad manifolds are well known for having very bad distribution problems. I sure hope you can tune around it.
Thanks. Yeah this is my first experience with them. It has a divider straight down the manifold dividing the 2 banks. It’s not a true dual plane. The carb adapters are also divided. I thought about cutting the divider out on them. I do have a Weiand 8008 single carb manifold if I can’t get these figured out