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I do. I thought that is what the sig. is for. I think I may have tuned the hesitation out of the carb with the idle mixture screws. Maybe the softer springs in the dist. helped? This thing has a real hard time idling in gear. Idles at about 1200 in park and will barely idle in gear. Some guys say this is normal for Mopars???

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Nope, not normal

What's your initial timing at? Initial timing CAN make a difference. Advance the distributor until you get max vacuum, then retard until you lose 1"hg. You should end up around 10-15* or so. Make sure the vac advance is disconnected/plugged while doing this.

You also want heavy enough springs in the distributor that you're not into mechanical advance at idle. Otherwise sometimes you'll idle a couple hundred rpms higher than other times (BTDT).