[Kube]

Apparently, you are working on a closed body style.
Any reference I may have made to a "loose fit" in my book (I can't recall) would have been for the convertible coupe.
Okay, the tack strip does not get disturbed nor does the headliner.
My first concern is the glass you have. Where did you get it? I have seen some cut straight along the bottom edge which not only will make it quite difficult to install, sooner, rather than later, the glass is likely to crack from the bottom.
The bottom edge has a definite curve.
When installing the glass, use a lot of glass cleaner as lubricant.
I use .060" diameter nylon thread to aid the installation. When you install the nylon thread into the rubber gasket, it should be planned so the last place you install / remove the thread, is at a corner.