bottom line you can run TWO Carter/Eddys or ONE Holley, I guess the choice is yours. There is NO WAY to get the power of a 750DP/HP carb from one Eddy 750...or 800 Thunder. It's just not going to happen. The Out of the box Edddy 750 is not going to run well on a mild BB, even w/ the strip kit. However an out of the box Holley 750 will w/ a few turns of the screw driver.
The Eddy 750 isn't bad, it's just not meant for all out performance.