HEI in Mopar ECU casing
I'll repeat AGAIN "what I got away with". Just to see if I could get away with it, and one hole was already there, I mounted my GM 4 pin on the firewall "flat spot" up below the wiper and to the left of the dist. NO THERMAL GREASE, just mounted with two screws and an added ground pigtail I drove it two summers, both of which got up to 100F
NOTE that I do not necessarily recommend this. But it DID work!!
I'll repeat AGAIN "what I got away with". Just to see if I could get away with it, and one hole was already there, I mounted my GM 4 pin on the firewall "flat spot" up below the wiper and to the left of the dist. NO THERMAL GREASE, just mounted with two screws and an added ground pigtail I drove it two summers, both of which got up to 100F
NOTE that I do not necessarily recommend this. But it DID work!!