This may be helpful as well although its more for service tuning than performance tuning.
The New AFB Carburetor Chrysler Service Ref. Booklet 121

In this one they describe how the systems work.
MTSC booklet 66-5 Carburetor Fundamentals p.9 is begining of the step up rods and main jets.

And if you hunt around on Edelbrocks' website, there is a chart showing various combos. Here's the one. You'll have to decide how applicable it may be to your carb, but the idea will be similar.
http://www.edelbrock.com/automotive/misc/tech-center/install/1000/1404_manual.pdf