Stock 2008 and newer 4.7L QC's should run around a 16.5 to 17 second 1/4 mile. My 2010 ran about a 17 (from memory), but keep in mind that's with heavy tires, full tank of gas, 100 lb step bars, 100 lb trailer hitch....blah blah. Probably more like a 16.5 maybe lower with normal tires and without the extra weight. My track is about as good as it gets otherwise in terms of elevation. I've got mine to break 16's with just a tuner and drop in, with the same extra weight and tires. I'm hoping to hit 14's with the stall, ram air, 4.10's, exhaust, and a few other minor mods. I have a hunch I'll be falling short
I don't see any reason a stock 2008+ 4.7L single cab short bed with 17" wheels and 3.92 wouldn't run in the 15's. or close to it. My brother used to have this truck that I described and it was pretty quick compared to mine.