Val;
Contact John Lazenby, long time Club member and order an Uni-syn.
He can be reached @
www.royze.com That's his business and he works with Club members
This simple tool will allow you to perfectly balance the two Carbs.
It measures the air flow going through one carb venturi, and allows you to balance the other carbs flow.
You may have to adjust one and then the other, back to the first and then to the other, until they both match.
Cheap tool and works on any 2 or more carb setups.
I have used mine for 50 plus years first on multi-carb Hotrods, including Hemi's and on tri-power Volvo-Penta
Ski boats.