I was reading a site and they got a 15.3 out of a BASE DeVille...although it was a 2002, I am sure performance wise they are the same
My '93 DeVille with 81k miles (at the time) ran a 16.0.......almost a full tank of gas too, but I launched the car really, really bad, i think if I practice, get the $160 Fast Chip, and have only 3-4 gallons of gas (although I did have the trunk stripped) I can get a 15.7-15.8 which is what I origanally hoped for....but like I said I launched the car real bad and might have let off too soon, not sure.....
....this was with the 4.9, if the N* is 100more hp and 25 more ft lbs of tourqe, it has to be better then only .5sec.
I really wish there were more go-fast parts for the 4.9 out.....