The cheaper fans have only 11 hundred cfm.
Spal that size is 1700cfm. When you put the body on it has bad air flow. To my experience ( I had two 25th reps on Fiero base with Lt1. )
It run 240f (that is why I changed now in my Diablo build to higher Cfm pulling ) not only that since it was a kitcar all the heat was going or creeping into a cab. Now
I also installed a Oem Murcie muffler that is good 70lbs heavy it is insulated and even after 1/2 running you can put your hand on.
But that is my opinion easy to fix now then later when the body is on mounted