Here is a great tip I picked up from Jeremy Formato of FasterProms:
According to Jeremy, this will reduce 'rotor pack temps' 100°!
Here is his youtube on the r-n-r and how they do things (around 4:05 in the video):
This is a mylar insulator -- you can buy at Lowes, and use reflection tape!
I first made a template and then used it to cut out the mylar:
Not bad and yes, the SC Lower manifold clears as the mylar is not as tall as the valley cover bolts!
-Don