Top end disaster! 1980 RS250

This is my 1980 Suzuki RS250 that I recently traded for my 1982 Yamaha DT100 from my previous video. When started up, there is a nasty rattling coming from the inside of the cylinder, and upon further investigation, this is what I found...
As this is my first 2 stroke top end rebuild, any help is much appreciated in the comments. Thanks again and enjoy the video!!