Looking for a little advice on the timing numbers I just pulled from my 73’ Duster (backfire issue)

Mattax said
Yes and also its best to remove the hose going to the vacuum advance and stick a golf tee in it. Or remove the hose at the carb and cap the port.

When you readjust the idle mix, turn each screw in until there is a slight drop in rpm or vacuum. Then turn them back 1/8 to 1/4 turn richer.

From Chrysler

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Thanks for this. Super helpful. Now was I supposed to cap the vacuum advance when I was getting my intial timing? Or is that only if my car is stalling out when the hose is disconnected? I just disconnected the hose and both the hole on the carb and vacuum advance were open.