Lift Headliner for Shoulder Belts

i know the three point/should belt topic has been discussed to death and I’ve searched for the answer to my question but didn’t find it. I have a ‘67 Barracuda notchback that I’m installing shoulder belts in. I feel a “hump” a few inches forward of the coat hook but there is definitely not a bolt here in it so I don’t know if this is where the factory would have installed the optional belt anchor or not. Either way, I’m going to need to put some type of plate with a threaded hole/nut in that area but I would rather lift the headliner to do all this work instead of cutting it and hoping I don’t cut too much or more than can be covered by the shoulder belt sash. So, can the headliner be pulled up to reveal enough area for me to work without hacking it to pieces? The headliner is original and in too nice of condition to start cutting it up and make a mistake. Also, how do I remove that black, roughly one-inch wide, trim strip that runs the length of the headliner where the headliner ends above the door? I’ve got the factory service manual and the Barracuda supplement but cannot find my answer. Thanks for any help.
i know the three point/should belt topic has been discussed to death and I’ve searched for the answer to my question but didn’t find it. I have a ‘67 Barracuda notchback that I’m installing shoulder belts in. I feel a “hump” a few inches forward of the coat hook but there is definitely not a bolt here in it so I don’t know if this is where the factory would have installed the optional belt anchor or not. Either way, I’m going to need to put some type of plate with a threaded hole/nut in that area but I would rather lift the headliner to do all this work instead of cutting it and hoping I don’t cut too much or more than can be covered by the shoulder belt sash. So, can the headliner be pulled up to reveal enough area for me to work without hacking it to pieces? The headliner is original and in too nice of condition to start cutting it up and make a mistake. Also, how do I remove that black, roughly one-inch wide, trim strip that runs the length of the headliner where the headliner ends above the door? I’ve got the factory service manual and the Barracuda supplement but cannot find my answer. Thanks for any help.
Hi, My 68 Notch has factory shoulder belts, thought maybe this pic may help.

68 Cuda shoulder belt hard point.jpg