Rick - I can't tell you how much your comments mean - they sound right on.
I can't answer a lot of your questions about the setup - I "inherited"

the car (from the DEA) with 2000 miles on it, so I don't know much motor history. I now have the original ERA build sheet and ERA was able to determine it is a 428. I figured the carb size (750) after talking to daltondavid on part numbers.
My basic question is: Is there a good web site where I can learn enough about Holleys to take it apart to determine jet sizes?
Then I can work with you to figure out where I go with it.
Thanks!
