hey. i have a 03 RCSB 5.3L i am Doing some research on mods before i waste money on the wrong specs. i have a monster transmission, Yank 3200, and 373s on order. i have volant cold air, borla exhaust w/ no cats, electric fans, asp pulley, throttle body spacer, street tires, and diablo sport. im ordering cam, intake, headers, 410s(selling the 373s). but should i have my stock heads worked or buy heads? im looking at the TR220 112 and springs and rods for stock heads. Maybe some machine work. I am stumpt about what to do to my heads. If you can give me any info i would appreciate it alot.

Thanks,
Matthew