1986 Chevy K10 Rear Upper Shock Mount Frame Cracks

[BAM_86]

Hello,

I just bought my first Chevy truck, a 1986 K10 Silverado Shortbed, and I am currently in the process of getting it ready to be my daily driver. However, I noticed that the truck did not have rear shocks and upon further inspection discovered that the frame around the shock mounts was severely cracked on the passenger's side and on both sides the holes are widened out. I have some welding experience and access to a welder so I am wondering what the best way to go about fixing and reinforcing this is? Here are pictures of the new truck and the cracked side. I have removed the bed from the truck to make it easier to get to. The hole on the driver's side is only widened out, but the frame is not cracked around it. Any advice or suggestions are appreciated.

Thank you