i am building a turbo vortec 5.3 w/ a LS6 cam & springs, it will be blow thru, other then that it'll be stock. i have all the parts. i am just not sure on what turbo to get. any suggestions? i was thinking along the lines of a turbonetics T-66 .81 a/r or T-70 .81 a/r or even a master power T-70 .84 a/r. id like to be around 600 hp @ 18-20 psi thanx for any help!