the tail pipe hangers might be able to be used but I currently have this on the 68 L78 car. Im not a fan. I plan to replace in the future with something more day 2. I have an old Thrush transverse muffler and maybe have a system bent up like I did my 67. I ran the Pypes Race Crossflow Muffler and it sounded decent with an X pipe. Here are some photos and links of that system and a couple clips of the green car and my old blue 67. But to answer your original question you can use factory locations but not the clamps on the tail pipes.
Green car - Flowmaster system.
https://youtu.be/V5gfTQgrzxABlue 67 - Pypes muffler and fab'd exhaust to sorta factory
https://youtu.be/8H7rZxQ5tbU