1970 Chevelle 396 HEI Ignition No Spark

If you cannot do anything else, pull the dist out lay it on a bench and find some alligator clip jumper wires. Consider pulling it apart if necessary and connect back with the jumpers and device a way to get power to it. These are essentially a Mopar 4 pin box all packaged up. What I mean is they work very very similar.

You have a module which must be grounded, and of course that is the dist. case, so the case must be grounded

You have 2 pickup wires just like Mopar, and you have a 12V power to the box which also feeds the coil primary.

Last, the cold or switched end of the coil goes back to the module.

It has been decades since I've had one apart

Scroll down this page, there's a helpful chart down towards the bottom:
https://www.gtoforum.com/threads/electrical-hei-distributor-basic-diagnosis-procedure.126457/