I weld and repair those all the time. $30 + shipping. You'll need to split the case and strip down to just the case side so I can clean, and bead blast for welding prep.
A heli-coil will hold fine on the lower spike. In fact a properly installed heli-coil is stronger than the original threads. I can install one if you want me to weld and re-machine the upper mount.
I think this was a 461 case I repaired.
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