Well what would you like to know?
The 5.3 was quick. I'd guess low-mid 12's. Tons of fun, and got good mileage(30) if you could keep your foot out of it. Best part is with my 275's, it hooked on the street.
The LS1 is a completely different animal, and if you've followed along, you'd know it is FAR from stock. It has an absurd amount of torque, and will blow the tires off effortlessly in first, and for about the first half of second. Its still decent on gas. Mixed driving i get about 20, but once you open it up, HOLD ON.