Some items to look for:
1)Skid plate on K frame & date on K frame should be close to build date of car
2)Dash vin, door vin, rad support vin, trunk lip vin, block vin & trans vin should all match
3)Dana 60 if it is a 4 speed car
4)Should have complete inner & outer trim set on rear tail panel
5)Should have wood grain rally dash assembly

Good luck!