I've checked around a bit and i cant find the darn thing, i have a feeling it may be causing my rough idle but i'm still getting 15mpg... so anyone that can help me out? 78 fwb w/425 4bbl. thanks

Ignition control module is in the HEI distributor. Under the rotor and weights. It's got 2 wires going to each end.

haha. that makes sence why i couldnt find a lil box somewhere

Looks a little like a domino with electrical connections on each end.

i'm still having this rough idle problem, ive replaced all of the cracked vacuum lines, ran carb cleaner through the tank several times, oil change, fuel filter, complete tune up, everything i can think of. still runs rough. what am i missing? could there be a burnt valve or something else that causes the surge at idle? i'm stumped.