440 going with efi?
There are a lot of home brewed systems out there and also some box systems. Right now I am following this build for megasquirt:
http://www.dodgecharger.com/forum/index.php/topic,99432.0.html
But also have researched some others systems such as Fitech, Holley and Edlebrock.
For my car, I am using and doing the Megasuirt Pro with a lot of insights from the Charger forum build