I'd never recommend a 3 circuit for the street. You can kill an engine on a short freeway drive with a 3 circuit. Driving at part throttle with the manifold vacuum under the throttle blade sucking fuel right out of the intermediate dump tubes will wash the cylinders and stick the rings. I've seen customers over the years destroy expensive engines doing that.
That is why I lean down the transition and idle circuits to prevent them being way to rich at light part throttle cruise on the street
Dominic, Thumper Dart,760-900-3895, can fix them up for anyone wanting to drive a 3 circuit on the street
