Ok, here's a constructive comment for a change;
There's very little R35's around in the entire country, then again the section of those that is silver is smaller again. So the chances are pretty small.
On top of that, the chances are that if one was available and in Silver, they'd live in Sydney. So out of the $200 on offer, they'd be making $150 after expenses...
....but the biggest issue? Someone with an R35, which is worth over 100k, probably has plans that dont involve formal runs.
Sorry to be blunt.
You're better off to find a nice R34 GTR (and there's certainly a few of them on here) and make the offer to the owner. If you find one with a big exhaust and cams it will sound downright angry and lets face it, you want it to stand out in the crowd and have a better car than your friends - the sound of a tuned RB26 at idle with cams will sound so much better than the usual formal cars like H2 hummers, S class Merc's etc, believe me that will grab attention.
Here's something I took my mates sister in to her formal a few years ago, this thing sounds great and there wasn't a single person in that line not looking at it. Sounded a million times better than the other cars there on the day;
End of the day, you'll have better luck finding an R34 GTR. Good luck with it.