Custom exhaust help

I am in the process of putting a 440 and 727 in my 65 dart, The only thing left to do is finish the exhaust. There is a custom K member and room has been created to run 2.5" exhaust pipe out in front of the motor then under the motor and back. I am wondering what problems I could run into with routing the tubes out that way. Clearence issues suspension issues etc. Any help is appreciated. I'll take some pics and post them as well.