Stock rocker arms? Is that meaning stamped steel? If so get rid of them and get some adjustable's. That's a pretty decent hyd cam should make over 600 hp easily. Degree the cam? Break in the cam with proper lube?
Yes,stamped steel rockers.
Broke the motor in with Joe Gibbs oil.
We did degree the cam.
Hot rod magizine built a 573 hp and used stamped steel rockers so I doubt that would make me lose that much hp and tq.
http://www.hotrod.com/how-to/engine/1412-how-you-can-build-a-stout-537hp-street-440/
