Sorry.
$500 is a very good deal for a parts car or a fixer, but most 92 SVXs cost 3 to 4 thousand, and I don't think you can expect this one to run for long without investing that kind of money in it. They are wonderful, safe (aside from the temptation to drive like a maniac) cars, but they aren't cheap to fix and they aren't cheap to insure. Considering gas prices, they also aren't cheap to drive.