Siggy:
1997 k1500 ,ECSB, 350, personally built 4l60e with 2000 stall, air raid CAI, ported MAF sensor, ported throttle body, magnaflow catback with moroso spiral flow mufflers, flowtech shorty headers, escalade 3.73 rear end, underdrive crank pulley, overdrive alternator pulley, 411 swap with a custum tune, electric fan conversion, hypertech power programmer, viper push button starter, caddy cluster, 6000k HID hi/low conversion kit, blue interior LEDs-galore
Not trying to be a bummer, but I would be surprised if you were sub 16's.
Take it to a track weekend and run it. Anything else is just racing the planks and pointless.
You will also get accurate 60 foot timings.
0-60 mph with a wrist watch never works out right. I do mine with an accelerometer and it is always more than what you time from what you think you see.