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The Prestone super flush is OK but you may find that you suddenly have leaks after using it (and then the trip is off). Of course, you should be having little leaks now if it is gonna leak bad after a flush. Um, one of the leaky areas could turn out to be the heater core so be warned.
Very worn (weak) points can cause pretty severe ignition scatter, too. A pertronix or other electronic ignition conversion kit can help unless the wobble is so bad the shaft can be moved perceptably sideways by hand pressure! The reason is that the trigger for the elec.ign. is not actually riding on the shaft so it won't be side-loaded any longer and any "wobble" of the shaft won't affect the trigger signal (unless it hits it, of course).
You didn't really say, did the mechanic actually tune-up what he could or insist on a new dizzy before touching anything? If you have a vaccum advance, a small perforation in the diaphram (in that can-thingy), a piece of hose or a vaccum line can really mess up the spark timing.
A truely clogged radiator will be pretty cool to the touch when the gauge is pegged instead of blistering hot.
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Mike!
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