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125 on your old V6 and your driveshaft didn't self destruct? You were lucky.
Even luckier when I tell you I did it more than 10x before I quit street racing. At about the time I got into a car chase with some ricer Focus, I realized how stupid and immature it was.
If one wants to push a 2005-09 Mustang to 200mph sure I think its possible, just dont see it happening with a 4.6L v8 though.
Now if you were to get your hands on a 5.4L supercharged engine then I think its possible it may hit 190ish ... but you'll be right at redline I think. not sure.
Im taking this figure, RPM X the final gear ratio = MPH..... so if you put your car up to 5000rpm multiple that by 3.31 (gear ratio in axle) = 165 mph. 5000 X 3.31= 165.