In terms of increasing the crank strength you can grind and polish the hell out of it, it will take about 2.5 hours to do so.
Set it in the block in two old bearings and remove all the sharp edges not only the casting seams..
While your at it you can somewhat knife edge the leading edge of the counter weights if the crank will need a re-balance job.
Note also that there are a lot of sharp machining edges left in the main web area of the block from the ruff cutting work to get the cylinder bores started.
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