Working on this, and have done a lot of research.
Slantsix.org has a great page with lots of info.
http://www.slantsix.org/forum/viewtopic.php?t=28732&highlight=hei
Use the links in the first post for more info and parts list. I have about $80 invested and on my third design of a coil mounting bracket. I would like it to fit in the stock location. And might mount the HEI where the the ballast resistor was.

I am tired of not being able to get parts at any parts store, (We have to order that). I want reliability so I can drive my cars any where.

Adding relays for the head lights was the second best improvement To any old mopar in my opinion. First is having the steering box rebuilt by steer and gear.