How do I remove center bezel on my 71?

Pull the glove box liner and reach around. You might only need to remove 2 nuts attaching the climate controller. Those draw the bezel, metal dash and controller together.
In other models, ( they aren't all the same ),
There are posts cast on the bezel going through holes in the dash. Speedy/cut nuts were screwed on those. I use a 3/8 or 7/16 deep socket on a disc ratchet. If they are all the same the post is 1/4 dia. and hollow. Standard nut would be 7/16. Anyway...
One or more of those nuts may have cut threads in plastic to overtight stripped. Remove all that will back off then pry outward on the bezel while turning the stripped nuts usually works. I have had to shove my door panel fastener tool between the bezel and dash and between the dash and the nut.
Your bezel does have exposed screws so there may be none or fewer of those hidden cast fastenings.