1974 Scamp some assembly required

Found it. I also see that you used the bracket that bolts it under the distributor. How do you like that?
HEI in Mopar ECU casing

I have a couple of the design 2 drive brackets that mount the hei under the distributor.
It works fine, and hides everything, but if you ever had to change the module you would need to pull the distributor.
The car I am building now, will have the module mounted on the firewall.