Whats the difference ? 4150 question !

Agree. I would call Dominic, at Thumper Carbs. He is on moparts (sorry) and facebook. Mopar guy thru and thru, real carb guru. If you think you need more than an 850, i guarantee he will recommend a dominator. In my opinion, the claims of 1000cfm from a 4150 are just fantasy.
Glad he's on moparts cuz I don't do facebook