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msinghof
I had a similar problem on my 514 SPF after an engine rebuild that included a new distributor. The car had 5000 miles on it prior to the rebuild with no paint problems. This included much slow crusing in very hot weather. The original distributor was set up with 20 degrees total advance and was set to run 12 to 32 degrees.
The new distributor was built with 30 degrees total advance (won't get into why that was), so it was set to run from 6 to 36 degrees. The paint started to blister almost imediately. I modified the weights to 22 degrees total advance and now run 14 to 36 with no problems.
Some thoughts you may want to consider
You may want to give it more initial. 14-16? when you go too far, its pretty obvious due to hard starting and and knocking
Too lean can also contribute to this problem. It may be worth getting the car on a chassis dyno to find out exactly where the air/fuel mixture is.
Good luck...
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