You don't need cams. GSR cams will make 650 whp. I run OEM cams now and OEM gears.

I did all my own work, built the motor and everything so you can do it.

The only head work I have is a 3 angle valve job and port matching on the intake and exhaust. I'm working on some new upgrades that will likely put me closer to 450 so keep your eyes open.