67 dart emissions

67dart273 is RIGHT. the fed gov had NO emissions spesc for 1967. i even have a factory paper service manual i can use to prove this. i was in high school then, we studied this. we found out 1968 was the FIRST year for lean idle. in 1968 was the first year for the AVS carb, with lean idle. most AVSs will give a flat spot off idle. however i can fix the flat spot. you might try putting some methanol in the gas, about 3-5 gal methanol in 7-8 gal of gas. it will run bad, but you have a better chance to pass. or use some E85