Check your distributor and make sure your mechanical advance is working properly. I had the same problem that you're having with my '68. It turns out the advance mechanism in the distributor was not giving me all the advance the engine required. I disassembled the distributor and cleaned the breaker plate and advance weight holder where the distributor shaft goes thru. I also cleaned the distributor shaft. There was dirt and gum here, which prevented the advance weight holder from moving fully. I then reassembled the distributor. The advance mechanism in the distributor now functions as it should.
Also, you may want to check the vacuum advance unit and make sure that that is working properly as well.
At highway speeds, you should be getting about 45 degrees BTDC total (including vacuum) advance. Your total timing, without vacuum, should be around 34 degrees BTDC. With the problem above, I was getting about 25 degrees total, without vacuum.
You'll need all that advance to get the car to run cooler on the highway. Retarded timing will always cause the car to run hot.
If you feel uncomfortable doing the distributor work, find a shop that can do it for you.
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