Exhaust system for a 1965 Dodge Dart GT

Hi all,
This is my first post on this forum...so I hope I'm in the right spot!
I have '65 Dodge Dart GT I'm rebuilding (almost done) with a '68 built 318 driving the stock automatic tranny. Currently it has the Y pipe which then splits into a dual exhaust (pretty mickey-mouse). I'd like to put in a header back dual exhaust system, but can't find a complete system for sale anywhere. I did buy a NOS Y pipe I could use to split into two for welding onto the rest of the system if I have to, but I'd really like a full system - the engine is strong enough (10:1, comp cam, etc) but the current exhaust is not helping IMO. Does anyone know of a full dual system that can be ordered for the '65, or at least a setup I could use to weld up to a split in two stock Y pipe?
Thanks for any help...
Tom