Originally Posted by blazer3664
It will also depend on how much power you plan on making. I want to say the 5.7 TBI is good to about 400HP, and the 454 to about 500-550. More of a problem getting enough fuel flow than air from what I've read on them.
I hear the stock 454 TBI unit flows around 600-650cfm, but I could not find concrete numbers anywhere. There are also places that will bore out your 350 and 454 throttle bodies to support even more horsepower.
I am personally going to switch to custom MPFI for my next 401, but boring is something else for people to consider.