Thats cool, I've never seen the HEI control module used like that. You got a part # or application for that module? I wanna make me a set up like that!
It's the "standard" old 4 prong HEI module that came out back in the 70's, up into the 80's. I dont know what all if fits It must be mounted flat to some sort of metal heat sink (the box in this case) with thermal grease. There is a simple little plastic locator pin that must be cut/ filed off to allot the module to sit flat, or drill a clearance hole for the pin