Doesn't the V6 Mustang do a 0-60 in the low 5's? Hard to tell but it looks like you had him up to about 60.
Car and Driver measured 0-60 at 5.5. But yeah it was pretty close until 60.
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I wouldn't worry about using 4wd for launching either on pavement as long as your going in a straight line. Use 4hi though and not 4a so you can just be locked in 4hi. Just don't turn in 4hi on pavement. I've made more passes than I can count in 4hi in my Ram and a a buddy of mine races his raptor all the time in 4hi with mickey thompson radials on all four corners without issue.