Adding to Mark's reply:
The buzzing in the rear seats does not seem normal to me, or at least it is not normal for a '65 normally aspirated or a '73 P337. I can't think of what it would be.
The only part of what you described that I would be nervous about is the oil. Wet to the touch is not normal. I would follow Mark's suggestion, and identify where the oil is coming from.
Kevin
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