So I didn't have this problem last summer with the stock Radiator, though the car was running very hot 200 degrees+ at the block.
But when I changed to a new, efficient Radiator, reset the timing to 30 degrees advance at 3000 RPM, and added a six blade, plastic "puller" fan, that's when the problems started...
I guess that's why I'm skeptical that the problem is heat from the headers - though perhaps the addition of more heat under the bonnet + hot headers was enough to boil the fuel in the float bowls...
It seems that wrapping the headers would be the cheapest option to try first...and I will probably try that...
