The Flowmaster Super 50 will be fairly quiet with the 2 1/4" Dual Inlet and Single 3" outlet. Nice deep rumble without any popping or clatter. This is also a Chambered muffler that will NOT degrade like others that have the Packing inside.
The Flowmaster 70 Series will be closer still to stock sound.
BC has a Very nice kit with Headers included, however I think it's the muffler itself that is too loud because it is so small/short. There are 2 longer versions of the same Magnaflow Muffler. I went to the longest version with their kit on a 69 Bronco with a 347 and it was pretty quiet.
I would go with the Chambered Flowmaster Super 50 or the Chambered Gibson Superflow. Both of these have the nice, deep V8 sound.