Cam HP capability

What did the heads flow at .300 and .400? That is the range the cam will be. You lose about .018" lift due to the pushrod angle, so you're down to .477, and really, it isnt spending much time at that lift. It's soending the time in the .350 lift range. With a 4" arm, and close to stock LA ports, no way will it make the 400hp level. You can go way larger and not loose any drivability. What do they flow on the exhaust side?