Thanks!! Don't be scared of setting up a diff, it just takes patience. There are plenty of guides showing how to do it correctly
The 13 bolt shave does not require machining the ring gear, just cutting off the bottom. If you find a drum brake 14 bolt not the newer ribbed disk brake 14 bolt, you can do the "13 bolt" mod without welding, just a sawzall.
Gotcha... yeah I have an older 14 bolt sitting around and a flat top knuckle D44 (supposed to be the strongest of the Chevy D44 fronts) front which i'm most likely going to ditch when a D60 pops up for the right price.
I'd seen quite a lot of 13B conversions where they had to shave the ring gear down but looking back now they did take off more material so I guess it depends on how much you cut off as I just looked up some that also never shaved the gear. Learn something new every day there.
Good to know about not needing to weld as while that is something I need to and want to learn I know don't really have the time or place for a welder in the city and can't really justify buying one to leave with family that I may not see for months at a time. LOL.
You are right about the drain plug and was wondering why yours had one. Didn't realize your 14B was out of a newer chevy. So that means you got rid of the 14BFF you pulled from the CUCV and got a newer one for a higher gear set? 3.73?