brian tooley cams, tsp cams, and others are quality cams and great companies to deal with. by no means am I saying otherwise. go to
www.carcraft.com and read the 5.3 cam dyno article. they take a boneyard stock 5.3 and dyno it with a bunch of cams. the ls2 cam gave the best rounded out performance. good hp, good tq, and good driveability manners. iirc 210ish dur and 550 lift. not saying don't use the bigger cams just consider that if you go bigger you loose driveability and cost more $$$ when buying dual springs, hardened pushrods, or custom tq convertors, so on... in the carcraft article they tested the stock 5.3 and with the ls2 cam made 403fwhp. well if you take that up a notch and start with the l33 ho 5.3 with 243 heads and add an ls6 intake, add an 80mm throttle body, and some nice longtubes... your in the 425fwhp to 450fwhp territory really quick and not spending ls3 kinda money. have fun and happy motoring guys.