Did I screw this up?

Probably too late now, but it looks like you have a pretty good kink in the near side duct. That type hose is not the best for airflow, unless you keep it fairly tight. If you can, angle the fender elbows so they more directly point to the carb bonnet, and find some better style hose.

Fabric, not plastic, automotive defroster/ air duct would be better.