1969 Dart 340 cam selection help !!!

The person that is doing the actual work on the engine has informed me that the rods need to be resized and it would be cheaper to get new ones.
So.....now I have a good 340 block and crank to start out with.
He is suggesting hydraulic roller cam, roller rockers and a .600 lift cam
along with the aluminum cylinder heads. What type of behavior does the .600 lift cam give the motor, does it rev higher ? I never really understood the cam grind numbers.