if I had the money to repalce it with a new or good used one I would.
If i lacked the funds.. or was otherwise in a position I could not repalce it.
I'd clean it up as best as possible throw it on the bbq grill and get it hot.. then weld it with a nickle rod or whatever the supplier has for welding cast.. couple choices.. certanium.. etc.
and then peen it while it sets after welding.. leave it in t he bbq grill to slow cool.
SOMETIMES that works.. sometimes not.