Or a stroker. The point of a bigger engine for more power. VIA the stroker route, more torque. A stroker engine has a harder time spinning higher RPM's
(Due to the longer stroke having to travel faster to mantain the same rpm as a shorter stroke engine)
And a harder time making high HP above 6000 rpm's even with some radical street cam shafts.
Alot of what you read on the cam shaft car (RPM range) is out the window a bit on a stroked 340. Since you changed it so around much.
After a Hyd. cam, go solid for more RPM's. Then a roller.
Personnaly, I'd save the cash for a roller and be done with it.