In theory you've got about a 1.2 seconds less 0-62 (5.9 on a DE v 7.1 in a scirocco - both alleged on autotrader). You've got an extra 76 bhp (assuming an 11 year old Zed hasn't lost any over the years, which it will) and you're also lugging circa 200kg more about. The mods won't count for anything unless it's been UpRev'd.
On top of that he's got a modern auto, which probably shifts faster than a manual Zed (anyone?) and may even get off the line better (inertia?), unless you're dumping the clutch with the TCS off and keep wheel spin to a minimum. Sounds about right to me
If you could find somewhere legal and safe, you might have more luck from 60-122, than 0-62.