I think maybe you heard wrong.. Camming it will give you a bit more horses where you usually USE the engine...but not anywhere near what you heard.
Make sure to get the camshaft that is in the rpm range where you WILL BE using the engine..
Getting a cam that turns on between 3,000 and 7,000 rpm won't do you any good at all for most applications.
We used to call the cams we used "stump pullers" .. As mostly what we do use in our rides is the low end of the rpm range.
A camshaft that shows more horsepower usually shows it at the HIGH end of the rpm range.. Where the engine rarely is running..
Lots of my friends have cammed their rides with camshafts that barely will drive around town...and are terrible offroad. Sure they have tons of horses.. but they can't get to them below 3,000.
So be careful when purchaseing a camshaft.. KNOW in advance what you will be doing with that engine.
Big JIm