Question about installing 68 trim on a 67 Cuda windshield

Hey Guys, gals, I'm about to pull my rear glass on my 67 fastback. Having it done by a professional. When I get it out and clean will these clip screws self tap or will I have to predrill holes? Any advise on this would be great. Also. I read that the headliner on a 67 Barracuda requires the front and rear glass be removed. Is that true? and if so by changing to a 68 style rubber and trim will I still need to remove the glass to install, change the headliner?

Thanks everyone.