The other thing is, a true wide port is capable of making 1000 hp. But the cam you’d need to get there would pretty big, .850 lift range. Probably make peak torque around 6500 rpms. Needing pretty close to 6500 torque convertor, Not ideal for road course. Also would need off set lifters and off set rocker shaft. Rocker shaft set alone be about $1500.00
I’d go for 350 cfm you could make 700-825 hp depending on how much compression you want to run.
The things they hide, the way they spin things, the excuses that they make and the things they omit.