swap the primary jetting and secondary jetting.
this will be a step in the right direction.
By swaping the .098 primary jets for the .095" stock secondary jets you will lean down the low speed and cruise "jetting by 12% and lean down the primary full power jetting by 4%
Secondary jetting will be richened 4%
for more tuning you'll need to buy a tuning kit
consisting of jets, metering rods, power step springs etc.
you can read all about tuning edelbrock carbs here
http://www.telusplanet.net/public/gi...delbrock_1.htm
read it, know it, there
will be a test.

edelbrock carb do not like too much fuel pressure.
How much fuel pressure do you have at idle.
Should be 6 psi.
While you have the top off the carb swapping jets you can check the float height setting.