Dual Exhaust for 360 in '67 Dart

I'm sure this has been covered, if so somebody point me to the right thread(s).

I'm planning a 360 magnum install into my '67 Dart. The engine will have 350 ish hp and I plan to run headers and dual exhaust. I was considering TTi 1 5/8" shorty headers with 2 1/2" collectors and their off the shelf dual exhaust system. I understand my column shift may require some of their shift linkage components to clear. I do not have the firm feel fast ratio pitman and idler arm, mine is OEM, but I do have the bearing sector kit bolted on the K frame and Borgeson steering box. I have a '73-76 spool style style K-frame for the current SL6 and I have the Schumacher motor mount adapters for the 360. I will be running an A904. I have the factory torsion bar suspension.

What I'm looking for is any advice on header choice/pipe fitment etc. What is the best and/or easiest fitment? For example using the TTi system, other full system choices out there, better headers than TTi? Have a muffler shop build the pipes?

Another wrinkle, I'm old and I don't like loud pipes. My plan is to use quiet mufflers, perhaps narrow to 2" post muffler. Maybe resonators at the tail pipes to quiet it down a bit more. Shouldn't hurt the flow as the exhaust gases are much cooler by the time they leave the mufflers. Any thoughts there? Anyone recommend a quiet setup for duals?

Just curious if anyone wants to share their "do this" or "don't do that" experiences.

Thanks in advance for any input.

brian