Any chance these rods are the same rods used on the Carter YFs?
Also, just inquiring here, but did you run the nos distributor on a sun or allen machine before you installed it? The reason I ask is that I just recently put an NOS 235 distributor (2403) on my machine and the advance was coming in way later then it should have been. Turns out, even though it was NOS and looked great, all of the NOS grease and lubricant had hardened or thickened up. Advance weights were gooey and gummy. Had to take it all apart and clean it, then it worked as it should. Just thinking here. Hate to see this as a dual carb and distributor issue.
Vacuum advance, is there a number stamped on the advance? Some of them, while looking identical, require a higher amount of vacuum before they start to come in. If the ported vacuum ports for the carbs don't make enough signal (my weber DGEVs do not) you might have to swap over to full manifold vacuum to get the advance to actually work.
Last edited by mdonohue05; 06/27/18 12:38 PM.