Got Shell 93 Octane and now barely idles 1973 Dart 340

I cramped all the vacuum lines: brake booster to intake. Intake to vacuum amplifer, vacuum advance to the distributer, lines to the charcoal canister. choke vacuum line. No change in idle, except if I use my hand to cover the choke, then idle speed goes up, but it does not smooth the idle out. Exhaust is still abnormal with speed increase.

Thanks,
Eric