I didn't search out TDP for the fix... rats! There is just a wealth of knowledge buried here.

I did research the splayed main caps before the fix... I didn't/don't have the $1,200+ dollars to spend there.

The machine shop doing these repairs have reliably been repairing and building these diesel engines without any aftermarket products. They have instilled me with confidence in this 599 block... and perhaps the other 2 dead projects sitting in my garage.

Thanks for the input Jim.