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I'm judging overheating by the fact that when the heat guage reaches 12:00...
Better read your owner's manual on that point. Also, if your car hasn't boiled over, it isn't overheating.
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I was told locally (and possibly here previously) that the timing could need adjustment and that timing affects temperature.
While spark knock (pinging) can be the result of excessive engine operating temperature, it can also be caused by over advanced ignition timing. Timing issues could arise from improper setting/operation of centrifugal and/or vacuum advance mechanisms, as well as incorrect base timing of the distributor.
(BTW, lean air/fuel mixtures raise engine temperatures and are also more prone to spark knock.) Quote:
If that is correct, what do ask for from the mechanic?
Tell your mechanic your whole story. If he's a good mechanic, he surely ought to be able to properly diagnose and repair. If not, better find a better mechanic.
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...fan arrangement? I can foresee situations where a shround would be an obstruction more than a help.
Not sure what you mean by that. Yet, IIRC, there was no fan shroud used (or needed) in conjunction with the factory and aftermarket A/C systems on these cars back in the day.
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