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2) Choke pull-off orifice size (fill it in with jbweld and drill out in steps, starting with a much smaller than stock size) It may be easier to install a different orifice restriction in the vac hose going to the pulloff. I have seen some manual trans pulloffs with an orifice so small you can barely see it.




Tried the pull-off air door setting at .040", didn't help.
The current pull-off orifice size is .025". My parts carbs have .028", .031" and .033". I'll have to look at the '72 340 manual carb also. I can easily make restrictors out of nylon rod that are the same outside diameter at the pull-off.