One thing for sure. The IROC-Z was an extremely cool looking car and still is if it is restored to its original condition. But here are a few things to keep in mind about the car.
1) IROC or not, it is still a Camaro and has rust tendencies around the rear springs, trunk area, wheel wells and floor boards (rear) near the rear seat and door opening.
2) Camaro is not a preferred auto if driving in areas that have strong winters. Lack of traction on ice and snow can cause serious regrets about buying the car.
3) The over all make of the car makes the seats set low within the car. This often makes a person (fall) down into the seat and need to climb up out using the steering wheel as a grasp for ballance. Things to look for in the car would be worn out seats and springs (especially on the drivers side) and also a week or lose steering collumn.
Over all, if you are younger and stay on top of the car, then it's not a bad choice. But for us old dudes (me) it's a choice better left to the younger generation as the climbing in and out factor of the car, out weighs the looking cool factor while driving it. Good luck with the car. I hope that it all works out for you.