Advice on converter selection

Hey Guys - Looking for some suggestions on my setup (wife's setup actually).

Freshly rebuilt 318 with a Hughes whiplash cam in a 71 Dart.
Sounds awesome and runs great. Stock heads but i did just acquire a set of 302 heads that i will port this winter and swap.
Performer RPM with a summit 600 street and strip carb
904 tranny
3.55 suregrip 8 3/4 rear

My question is that my converter is old and tired. What stall would be good for this combo? Again, this is my wife's toy and she wants good sound (which it has), and a little tire smoking on occasion.

Any and all suggestions would be great.