Whoever told you that was wrong. I can show you how wrong that is.
30 years ago heads like these weren't available. So look around. These heads are so big you can't use them. Today, guys are using heads on street cars that were unthinkable 30 years ago. Why? Because they were wrong back then too. You just couldn't get the stuff.
You can run a much better head, use a smaller cam and make more power everywhere.
Or, you can use a head that is low on flow, and then add more cam so it will RPM where you want it and it will be a weak suck down low and a pooch in the low middle.
A good head is worth every penny.