Eh, $600 isn't a bad deal but is going to require quite a bit more money installed.
Wiring HarnessWiring Harness ConvesionSR WaterNeckSR Heater HosesSR CAS (can't tell if there is one)HotpipeIntakeMAFCrank PulleyAlternator + PulleyWaterpump Pulley
That is just what I can see. You would also want to check to make sure that the coil packs are there. Knock sensor, oil and collant lines, etc etc etc.
Might not be a bad project to pick up now and start accumalating parts over time and finding deals. You could probably get a crate SR for cheaper, but it wouldn't come with a free Coupe
