Cracked crankshaft?

MOPAROFFICIAL said

You have a 360 for backup?
Experiment for us ...See if its deep, if not..Grind it out just enough, mig fill it and run it. Its just a 318...or rebuild n rebalance the motor.
Im sure no one will agree.

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Drill a small stop hole at end of crack after mag shows where end really is. Then clean & maybe silver solder to wick crack totally full. Heat must be right! And a large chunk of steel like that may make hard to do(or undoable)or need to be oven heated.
You can weigh the stick of silver solder before and after, to see how much weight has been added, tho probably not much. File corner a little bit, if worried about it.
Get weld shop that knows silver soldering to keep heat right.
Harris also sells a white solder(not gold color like silver solder is)that has a 50,000 lbs strength & might work with less heat.
Use correct flux for alloy picked.
Brazing is old school & is much weaker, but good for a 'field repair' .
You'd have to anneal crank after arc welding it. Less heat to anneal solder, if necessary.