HEI in Mopar ECU casing

Jaguar was doing this in the 80's with their ignition modules. I had just tested one bad for a customer and for the fun of it undid the four screws holding the top on and found a four terminal GM HEI module inside. It even had the GM logo on it. I told the customer I could order the Jag. unit for $200+ and wait a couple days to get, or a $20 GM module sitting on the shelf. Can you guess which one he picked?