If you are talking about running one, than hell yes!!!! I ran one on my Z06 back when it had stock cubes. It was borderline for that application. It made 580rwhp at 12psi and didn't make much more power at higher boost levels. I switched to a T76 gts and picked about 50rwhp. I wouldn't do anything smaller than a large frame T6 on a 488+ cube motor.
i am thinking that a 70 gts being a non ball bearing turbo the .81 will help it spool faster i saw that one of the guys was running a 1.06 a/r housing on a smaller turbo