Mild Built 340 Timing/tuning help?

Rat Bastid said
Who said anything about emulsion? You were talking about the power enrichment circuit. My point is you can change the main jet and not affect power enrichment and vice versa.

Any time you have a metering rod going through a jet you change one you affect both. I learned this at 12 years old with dirt bike carbs.
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Rochester and Carter/Edelbrock can change cruise or power individually by metering rod diameter. If you find a metering rod with the same cruise dimension and a smaller power dimension, you enrich power without affecting the cruise A/F ratio. Changing the jet changes both.