Timing chain cover

I started what I thought was a easy and quick little project.
I found my timing chain cover has eroded and needs help.
I am not sure if I need to replace or if today there is something that will fix this problem. ( J B Weld )
To me I need to replace it.
Here is a shot of what I found .

http://s895.photobucket.com/albums/ac156/OldRidge/Parts/?action=view&current=IMG_2918.jpg

If replacement is necessary does any one have one it is for a 67 with a 273.