Cams for 318's

I have dual exhaust with 2-1/4 pipes.

Some people I know told me a cam would increase power. Getting mixed signals.
It will with other parts to go along with it to make it work well. It will produce more power but at a higher rpm and taking power and torque away from idle to 2500 or so. That's where you spend a lot of time when you drive on the street.