Where do find matching numbers on a 1967 GTO?

I am in the process in buying 1967 gto rag top I want to find out if I have a numbered matched car I need some info?
Tagged:
0
Popular New Cars
Popular Used Sedans
Popular Used SUVs
Popular Used Pickup Trucks
Popular Used Hatchbacks
Popular Used Minivans
Popular Used Coupes
Popular Used Wagons