Those brackets are an aftermarket piece. They were originally designed, so you didn't have to drill holes in your car. Mainly on Cudas, Roadrunners,and Chargers . They had nothing to do with heat, although it wouldn't hurt. They were also, never designed for A body's, so in my opinion you don't need it. You do want to mount your ECU in a cool place. Up on the fender apron is generally, one of the better places. For a slant six, this is a great spot. Its cool, and easier to hook up your wiring.
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