Not saying you didn’t, but always remove the pins first (while block is still bolted together) and install pins first. Just make it a habit. They come out better when everything is held firm. The pin is tapered so like mentioned usually give with a quick rap. On installation no need to drive then down hard, just for alignment.
Later service manuals show a special tool that can be made for removal. Works great! I’ll see if I can find a pic.
Dan in TN