Two things come to mind...
1) The starter is getting too hot for some reason. Could be due to the starter being "worn out" from all of the extra cranking you had to do when you had the dist. problem, or it could just be old age. I have a hard time getting fired up when it's hot, too...
2)The main battery cable solenoid terminal on the
inside of the solenoid is damaged, from normal wear/tear over the years. You can twist that terminal around 180*, and let it connect on the other half of the terminal to solve that problem, but most folks would rather just change the solenoid.
There is another thread here somewhere about this, when I try to explain how to do this. It's fairly easy with the starter off, but it is do-able in the car...it's just not much fun that way.
First things first, tho...check all of the connections and make sure they are nice and snug.
Here's the other thread...
Adams' Apple2010-11-03 10:08:21______________
Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"