Try
WWW.CobraRestorers.com they have good illustrations, and an easy to manuever website. I fabricated my own exaust for 289 with FIA style sidepipes. I used mandrel bends and cut and fit each primary into merge collectors that sit vertically in front of the footboxes. Then 3" 90 degree elbows to turn the exaust to the rear under the doors. It is an emense amount of work to get an exacting fit. I have pictures but they are too large to post on the site. I was able to get about 23" of primary length in an effort
to keep the torque up. Many hours but quite satisfied when completed.
Rick