Here's the Edelbrock carb tuning site.

http://www.edelbrock.com/automotive/eps_intro.html

You oughta be able to "Get er' Done" by following what they have to say.

Like R.Pope says, it's probably jetted for a 350.
You can find the rod and jet sizes as installed by the factory in the manual.

I understand both Holley and Carter/Edelbrock come jetted about 5% rich for the expected engine size the carb will go on.
Even so, give the factory sized stuff a go before you start changing things.