Edelbrock Thunder Series AVS?

I would say to stick with what you got. i have run a number of both these style of carbs and there isnt a real performance or economy difference between them. unless you had a raced out dominator then tried to put on a standard afb or something crazy like that. the holley has more tuning and performance parts in the aftermarket but for what your looking to do a simple jetting change might help you out a bit. get a wideband O2 setup and see where you sit ratio wise. im not sure how much better you will get with that potent combo though.