Ghost Tower of Inverness has always been one of my favorites, so I converted it for S&W. And by "converted", I mean I ran it exactly as written. I did have to convert the pre-genrated characters in the adventure. S&W characters aren't the same as AD&D. I didn't want to confuse my players by converting them on the fly, so I wrote up the pre-gens from the back of the adventure. Here they are if you would like to use them in your S&W game.
Swords and Wizardry characters for Ghost Tower of Inverness.