Highest flowing sbm heads?

So quick math for ya. At 4200 pounds and 115 MPH that’s about 500 honest HP. That’s a damn far cry from 600. You’d know that had you done it before.
And if you read a word I said, you know better than to even post what you just posted. I said with cam swap and exhaust swap, they'll make 600 hp and that is the cheapest 600 hp with reliability you can about get. My opinion. :) And it was for the OP of this thread!