I fill the heat crossovers with aluminum in all my Pontiac heads. There is no problem installing any EFI system on a Pontiac Pontiac's don't run hotter than any other make engine. When you use any of those throttle body units that have the computer in them, run a return fuel system. We don't have any troubles with those units in AZ, and these guys drive there cars when its over 100 degrees outside.
