Popping under acceleration then started to knock

Evening Gents. ( 66 Chrysler 300: 383) so I took the car for about an hour and a half drive tonight and she ran great. Came home and the wife asked me to go to the store I pulled out of the driveway got about a 1/8 mile down the road and I started to get an audible what sounded like a pop pop pop coming from the exhaust ( It sounded like an exhaust leak near the manifold) when I would push down on the throttle. I quickly turned into a parking lot which was right in front of me the car...

Popping under acceleration then started to knock