Haha, thanks buddy. If I would have known this was a 4.8 in question I would have skipped the nonsense and agreed with the 6.0 from the start.
No it's not too bad if that is dyno proven. I recall a 67 mustang I installed some stuff in that had low voltage problems due to U/D's. He replaced them to stock and his problems were no more. Granted our trucks have better factory alternators than a 67 stang, but I was under the impression that pulleys gave you 5-10 hp at best. Once again, not nay-saying, they just might not be the best choice for a stereo oriented person. I was just throwing it out there. You can never have too much power.