Repair
These lower firewall corner brackets are under a fair amount of stress in a -4, since they bear the brunt of landing loads. You could ask Vans, but this looks unacceptable in my book (i.e., it should definitely be repaired to avoid future problems).
You can replace these brackets (I did it on my -4 rebuild project), but to do the job properly, you also have to replace the side skins, lower longerons, and probably the firewall supports as well. It's a big job, and best done in the shop with wings, engine, and instrument panel all stripped from the airframe so you can build a jig to support everything during the repair.
The market for -4s is pretty depressed right now, so you might want to just shop around.
M