I installed my 350 in my build this weekend. i put the headers on to see if anything needed to moved or worldbe in the way. I found that there are some lines (gas and brake) hitting the header on the passenger side. They follow the frame, make a "U" around the motor mount, then back to the frame. I'm running Headman Headers.
Has anyone else ran into this problem, if so, what did you end up doing?