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

Mattax said

it won't effect timing if you had the rpm correct. It could affect idle mix and rpm if the throttle was open too far. More of an issue with later cars like yours with higher idle speeds. But if there was no vacuum on the post, then it’s OK.

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Thanks again! Looks like 5 degrees made all the difference. One last question I had is that with the vacuum advance connected and the car in Park the idle is right in the 860-900 range. Is that a little too high? Sounds good and runs well. Especially when in drive and my foot on the brake.