I do not mean to criticize, but my thoughts for your situation is to consider what some others on this forum have been able to achieve with the eddies. Tony Santos has regular mid to high 10s, Pittsburgh racer has achieved high 9,s with the Edelbrock head. Seems to me you are nowhere near maxing out the performance of the heads you have because other system on your car are not ideal yet.
I would go over what you have and see if other parts of your combo need to be addressed first. $3,000 is a lot of coin to spend only to get a marginal improvement if any. But I have no first hand experience, and this is just mho.