Eddy carbs are good for cruisers, but if you are looking for the most POWER get a Holley style carb (Holley, Demon, Quick Fuel, etc). 750 would be fine for your 360 (and would be even better with a HP or Proform main body).
It's going to suck gas no matter what it's a 410 ci motor! what you thought you were going to get 40+ mpg!it really won't help when your doing burnout's all the time.