It's an AWSOME intake, for low RPM efficiency, part throttle torque, and throttle response. (Commuter or RV/Truck manifold)
DOn't expect any big power at WOT from it, maybe about like a stock dual plane....
Love them, run two, ran LOTS.
Mains need to be richened up more than you would think, if you take the carb off a dual plane, or single plane, and bolt it on the same engine with a dual port, it will be lean.