Is this at Scrap I’m assuming it is

Is it a 360 crank? Guessing time I take it. Well if so the rod journals can be cut down .010-.040 or maybe even more if bearings are available. Or to Chevy size. The main bearings under .020 are harder to find.

Then ya grind it to the 340 main.
Lol you can save 'almost' anything.