I personally would weld it in. When I replaced mine years ago I used a die grinder to remove it. It'll keep the metal from distorting & will be a cleaner removal. Then used a small hand grinder to remove what was left & to clean up the old weld areas. I drilled small holes around the windshield pinch weld area so I could spot weld the inner & out lips together. I also welded it solid down both sides of dash just like stock. Clamped it all together & started tack welding it from side to side.
