Some of the pics are gone, but here is the thread.
http://www.cuda-challenger.com/cc/index.php?topic=62561.0
I found some of those missing pics still on my hard drive.
I used a "gold box" but obviously you can use any old box.
If you gut the box carefully you can save the part of the original circuit board which connects to the socket and wire the HEI straight onto that. That way it's stock looking and pretty much plug and play (though you will need to adjust the ignition timing a few degrees because the GM module fires on the other side of the signal spike).
Make sure you have a good interface between the module and the inside of the box near the original heat sink for cooling. As I used a gold box it had a good heat sink on there, but there's also plenty of room to add a slab of aluminium to the back of the module if you think your stock heat sink could use some help. Some of the modules come with a little pack of heat transfer paste to slap on the back.
If you want to keep a good stock appearance be careful to save the original switching transistor which may try to fall off when you gut the box out. I used one of the stock mounting points for the module but I had to drill a little hole for the second mounting. You can just see the tip of the extra mounting screw poking through the front (lower right hand side in photo). That's the only give away it's not Mopar internals in the box.