Vacuum And tuning Help

crackedback said
Then why did our 360 pick up almost 2 MPH going from any 4150 based carb to a 1050 dominator?

According to all the CFM calculators, the biggest 4150 based carbs were more than required, in fact, they were about 10% too big? Hmmmmm.

It clearly did something for power.

carry on.
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Easy, you went from a poorly set up 4150 to a better set up Dominator. When a NASCAR Sprint Cup 358 cid engine that makes 850+ HP, turns in excess of 9000 rpm and does it with a 4150 model 750cfm carb you are kidding yourself if you believe you really "need" a 1050.