Free GM Resource: Swords & Wizardry +Several Other Downloads from Frog God Games.
I ended up using Swords & Wizardry, which is available for absolutely free in a couple of places, but notably on the Frog God Games download page. It is up there with a couple of other items that you may or may not be interested in as well. I've already recommended A Quick Primer for Old School Gaming, but there are four other downloads to check out. Two are coloring books and the other two are adventures.
One of the adventures is statted for Swords & Wizardry and available for Pathfinder as well. The other is a 5E adventure. I'm thinking that 1st adventure (The Tower of Bells) might be a good example on how to convert between the two systems.......
...if anyone has already used that as such a resource, please let me know.