My 72 340 3 speed came with the 850tq.I swore the hood was going to get sucked in. Years later I tried a holly 600cfm non SB and even after being jet and set by myself and Mopar speed shop the cars felt like a 318 grandpa. Next was a holly 650. I believe it was a 8155 spread bore, and she ran better than stock. Again years later I tried after after advice a Edelbrock 600 non SB and she went back to the 318 dog. IMO stock or mildly modified they like SB