Update on the muffler. I talked to the owner of a shop that does some muffler installation. He said that they could replace the resonator and keep the same tips on the pipe. I left the car, came back and picked up my MGB. On the way home I noticed that the sound was louder, but not terribly so. When I checked under the car, I found that the shop had just eliminated the resonator and installed a straight pipe from the larger muffler straight back to the dual tips. When I went back to the shop I talked to the mechanic who had installed the pipe. He said that he didn't[t have a resonator so he just eliminated it. He said to drive it for awhile and he would order a small muffler/resonator and if I wanted it that he would install it at a no labor cost. I am trying to decide if I like the sound. It does remind me of my big Healey with a more throaty sound. I may just keep it like it is. I'll update the forum if I change for the smaller muffler.
Charlie