chevytruck22

Hey everyone, this is my first post. I have added headers with full exhaust, intake, mass air, and am looking at going with a new camshaft. My truck has 135000 miles, any good or bad exsperience's with doing camshaft swaps at this mileage? The bottom end of the motor is still solid, looking at pulling the heads to get them looked at. But also am concerned i might grenade the engine if the lower end isnt freshend up at the same time. As for the camshaft, i'm looking for good low end torque and lots of rpm, currently run around 6300 before theres not enough fuel, just seems to float a lil bit.