Suggest anyone playing with after market carbs or multiple carb setups invest in a wideband. Drill a hole in your downpipe and weld in a M18 bung. Figuring out main jet size will not nearly be as frustrating. These are cheap electronic tools that at one time only the rich and famous could own, now it should be in every enthusiasts tool box. Removing and reading plugs to determine correct air fuel ratios is like going to a barber shop for a tooth extraction.

Last edited by sstock; 09/15/2019 6:37 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration