Tom,
I would look at a vacuum leak some where. for the rough
idle. Perhaps on the parking brake release mechanism under the dash. That aside
the second place would be carburetor fort the rough idle. As for the A/C
noise, I think you are looking at the clutch assembly. You may get away with
just a bearing but the clutch itself may be worn to causing it to rattle. They
aren't cheep but relatively easy to change.
George
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