As far as headers, what style are you looking for? Assuming you are getting rid of your emissions stuff, the best bang-for-the-buck longtubes are Pacesetters. Just make sure you get the ceramic coated ones.
As far as the cam, I was personally never a fan of the LT4 cam, hotcam or not. You can find off-the-shelf grinds with better gains and just as 'streetable' for a lower price.
You will definitely need valvetrain upgrades as well, with springs and rockers that can handle the extra lift and such.