440 crank in 383 block
I asked about this last week.
It was 370-385 to do the grinding required on a factory 440 crank.
A new source crank is about $599
If you factory in a 440 steel crank core at roughly $100+ you are pretty close to a new one that isn't a 40 year old piece.
Yes you can line bore the B block to 440 mains. It's another expensive approach.