Exhaust for 360 to fit on a 74 Duster?

On my 73 duster, I ordered head-pipes from Accurate Ltd to get me down to the cross-member and hooked those to a 2 1/2" header back kit from either Summit or Jegs. 2" Head-pipes from Accurate fit like a glove. I'm sure the flow is not the greatest, but I think plenty for my basically stock 318. Older guys have said it sounds similar to stock musclecars back in the day.