I had a fully loaded 70 Pontiac GTO with the 400 engine..I can not say anything negative about it..It was a excellent car..In the 60's-70's Pontiac was one of the nicest looking cars [besides the Fords] on the road.
I've seen one in person and they are nice cars. My ex and I bought a brand new 98 GP GT and that car was a blast to drive. It felt like it had a V8 under the hood. She sold it a couple of years ago with over 200,000 miles on it.