When I was. exciting a major highway the engine without waringng suddenly shut off for a few seconds, then there was a very loud backfire. I coasted to the edge of the road was able to restart engine which was now loud. Looking under the car one muffler had the bottow blown out. 70 FB 302 2v w/ headers.Am I correct in thinking its a points related problem? Car had been running great. Thanks for any held.