600 edelbrock secondary bog.

If you can't tune an Edelbrock, good luck with your Holley.
You are going to be futzing with that thing more than a British motorcycle.

In regards to your Ede carbs. Put them for sale in the for sale section. I'm sure you will have many takers. In fact, how much do you want for them ?
I'm sure if they suck so bad, they should be going pretty cheap, right ?