Forged 273 crank in an early 360 Block?

I would like to build an internally ballanced 340 from a 360 block & forged 273 crank.

I know that the 273/318/340 cranks have a wider main bearing journal than the 360.

I have a source for a forged 273 crank that I can pick up cheap. Can the offending journal be welded & reground.

My father in law has an automotive machine shop, but he is more of a Chevy man so I doubt he has done this.