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I had a similar problem - run for a while then shutdown. However, my problem turned out to be in the way the coil mounts to the distributor. There are two contacts that are made by compression when the coil is placed on the distributor and held in place by the bail. One contact is a small spring that extends into the distributor to mate up with a screw head to the points. The other is "bent tongue" type contact. The one that caused me problems, the start ok, run for a little while and crap out, was the spring that extends into the distributor. The spring had become soft due to it's long life and because of being heated up and cooling doing. I discovered that corrosion had also built up on the end of the spring tip. Thus, I had a high resistance connection and after while, due to higher resistance as the temperature rises, there would be loss of spark and bingo the engine would shutdown. I cleaned off the corrosion, stretched the spring out with a little, but very gentle tug, installed the coil back on the distributor. No more problem!
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