sbp wheels cause high brake temp?

Ralley wheels are thicker and stiffer than regular wheels. They also have the cooling slots. I regularly took my 64 Cuda with KH manual discs to 140 mph and back without any over heating or poor brake life. I did not road race it so that is out of my experience. The rings on the back of the rims were a running change by year not brake application , I believe. I have also heard that the 9 inch brakes are very weak and should be replaced with 10 inch drum or a Disc setup as soon as possible. Something about attaching bolts breaking?