Hey FormerCA,
Chief seems to be lacking in the customer relations department, huh?
The ZDZ's seem to leak gas out the carb at idle, seen it first hand, and have heard the same from many others......One guy said to try a velocity stack, but no confirmation on that yet, and that rear carb is fun to mount too, performance is good, but your gonna have to add dead weight to balance the plane out. I would go with a twin from BME, or DA instead. In the long run, your probably gonna be more happy.