Both the above posts are correct... youre going to want to inspect as much as you can see. Since its an older car, youre going to want to look at places that arent normally visible. Lift up the corners of the carpet, pick up the spare tire cover, get down on your back and look at frame rails/rocker, look in wheel wells. Bring a flashlight with you even if youre doing it during the day. It will help you look behind the engine or under the car.
Are you sure thats a 70?- it has earlier 68/69 sidemarkers and a 68 grille (though the panels are a different color so all of that could have been swapped over)