Running Main Bearing Inserts To use A 383 Journal Crank In a 440 Block

Has anyone here done such a thing in the past? I am thinking of doing such a thing.

I know that they were produced years ago, just haven't found any link tot hem today.

Tom
Based on what I read your intentions to be, RESPECTFULLY, I feel you'd be focusing a lot energy in an area that will show NO benefit. But worse it opens up the possibilities of something else going wrong. So many other areas you can focus attention (time/$$$) on for gains. Or said differently plenty of low-hanging fruit elsewhere.