you know there is a WAY simpler way to remove the piston after the gudgeon pin is out eh.. rotate the crank so it pushes that piston to the top of the bore and the rod (disconnected) to the bottom, then with hands or otherwise, twist the piston 90 degrees down the bore....
now the rod wont insert into the piston as the hole /slot is 90 degrees offset...
rotate the crank again and the rod will push the piston out the top
youl want a piston, and a new head tbh, given its age etc, you are almost in rings and bearings land too..
which looks more like a full rebuild
agree