1974 Brain Box saves the day.

Talking about heat sinks, what is the operating temp of the transistor and the unit as a whole? Would there be a benefit to installing it in the cabin and getting it out from under the hood and away from 600° exhaust?

Good Point !

Would like to take a lazer heat temp gun and find out what the running temp is there at the gold heat sink right at the Top Hat Chrome Transistor casing of the module.

The bigger engines with headers are definatly increasing engine bay temperatures, maybe so much so that they are stressing the control modules and leading them to failures.