Problem you'll have at those $ is a really good cab (rust free) is worth about $2,000 or more. And it is worth it paying the extra to avoid curring out rust! Keep an eye on Ebay, there are some nice cars on there but more like $3,000. Examples:

http://www.ebay.com.au/itm/HOLDEN-HZ...#ht_139wt_1143