Dennis,
When you say it is over heating, do you mean it's boiling? Little Birds enjoy life in the 1500 to 2500 RPM range. When you take them out side that range, you stand a good chance of seeing it on the temp gauge. Never mind changing to an electronic ignition. You have already thrown enough money at the problem. The best place to start, is to get everything adjusted to where it is supposed to be. That means make sure your fuel mixture is not too lean, your ignition timing is right on, and distributor vacuum advance is within specs. Use a 160 degree thermostat and make sure your coolant mixture is less than 50% anti-freeze. Other items that get goofed up include improper fore/aft positioning of the fan in the shroud, and air leaks between the top of the fan shroud and the upper radiator tank. This is probably another case of a problem showing up because everything is not stock. Admittedly, the cooling system is marginal, but if everything is "as built", you should be able to use the car in 100 degree temperatures. If you have deviated from stock, all bets are off.
Tom
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