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Roy,

I am out of ideas. Pretty clearly something caused those two cylinders to run lean. You might want to contact the Weiand people to see if they have heard of it before. With an open plenum...

This is a Ford Windsor right? So #4 and #8 are the back cylinders? What style of manifold is the Team G? Single plane or dual plane?

How was the weather the day things went bad, was the air...

Since both burned pistons were at the back of the motor, it's possible it was a fuel distribution problem causing those cylinders to run lean. Could also be an air/vacuum leak. What fuel system are...