Changing the cam timing only changes the rpm that the engine makes peak power at thus changing the so called sweet spot a bit. It's not that important on a stock or near stock street driven vehicle and in fact is probably going to go un noticed. I degreed my race engines but only to have a reference point as I usually needed to move the cam to obtain valve to piston clearance.

If you are looking to make maximum power at a given rpm then moving the cam timing will help achieve that but it won't really produce more power, just at what rpm it makes it at.