I wouldn't touch the weights yet. How much time have you spent tuning this carb? the edelbrocks are picky with float level and fuel pressure. A high 11 second car will not need more pump shot than the factory setting on that carb. Not in my experience. I pulled my NSS 2x4 intake off and tried a single 800 on my car just to see what it would do as a comparison. It ran through the front half just fine ( 1.41 60ft and 6.42 ) it was laying over after that. It is more than enough carb in your case. Maybe too much. I would work with the jets, rods and springs first. What springs, jets and rods do you have in it now and what is your combo?

Go to the link Al posted and go to the white papers. You can learn a ton about tuning edelbrocks from Damon.