While you're whittling on that block, counterbore the rear main bearing cap area for this seal:

https://www.zoro.com/skf-shaft-seal-3-78x4-34x38-crwa1-nbr-38647/i/G9397674/

It eliminates the rope seal and stops that annoying drip from the flywheel housing dead in its tracks. I have a home-brewed mounting fixture for my Van Norman 944S boring bar that allows me to set up in the rear man bearing bore with the cats' paws and cut a square-bottomed counterbore the right size to press the seal into.
Jerry


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