This will leave you a lot of "headroom money" to make it up to snuff and/or for the unexpected/or premium gas
. You should read this and other boards thoroughly to get an idea of what is needed at what miles (and years) to get the car to a nice "baseline" maintainable, no-surprises condition. The "surface rust" thing is a little scary, because this can be the tip of the iceberg, but at that price...still not bad.