A body shock tower repair or replace

I have a 72 dart that had a 383 with fenderwell headers and apparently they had to cut out a portion of both shock towers to make them fit. The passenger side had quite a chunk taken out of it and the tower is a little shakey to say the least. What I need to know is should I repair or replace the shock tower. My first instinct is to repair it by welding in a steel patch. Any thoughts or suggestions will be appreciated.

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looks to be a rust hole there in the frame as well. I'd replace the entire thing with a new rail and tower. Could patch it if you feel up to it but usually easier to replace the entire thing