How about this, looks like it might work:
http://www.spintechmufflers.com/headers/street-car-headers/dodge/cat_63.html
Expensive but might be worth it.

They have other models at 1 3/4" if you click around.

Ran


"Hey mister, something's wrong with your car, it idles roughly" - number one comment I got in Israel when daily driving a 70 Barracuda with a lopey cam.

Currently working on - 1966 Dodge A100 van 318/auto
Finally - disc brakes on the front.
In the plans - rear disc brakes, B&M 250 blower