Welding cast iron is a do-able deal, but not that crack on that head.
Any repaired crack that has fluid on opposite side, is highly likely not to hold.
If you weld iron for structural purposes, like the possibly the exhaust flange surface,
That's a do-able repair.
Repairing cast iron is tricky at best.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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