i put dual webers on my slant six that were mounted to an offy intake that proline fuel had made but has since gone out of business. i am having a problem with burning to rich. there are 3 different jets in the carbs but i am not sure which to work on changing the mixture to get it leaner. any weber experts advice out there?

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'77 Volare..not much to look at but has it where it counts!

Not an expert but looking forward to the answer as I have the same setup and same problem on my 71 Dodge D100.
HyperValiant

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1960 Hyper-Pac Valiant(rolling test-bed)
1963 Valiant V2OO(Son's summer project,- he just turned 15 )
1972 Valiant 4dr(Daughter Kelly's repair in progress)
1974 Valiant (v8) daughter Kelly's work in progress

Contact Redline Weber or Piearce Manifolds. They sell the same setup and would have the jetting information.