Break in with TTIs

As To The Second Part Of My Son's Question What Are The Chances Of The Exhaust System Off Of My 79 Dodge Van Working On The Duster? I Know That The Manifolds Will Work But What About The Cross Over Pipe ? The Van Has A Single Exhaust And Yes It Would Be A Pain In The Butt To Pull All Of This Off The Van And Then To Find Out It Wont Work !!!

Thanks,bob