Funny this topic should come up, just came in from helping put my son's 360 lower end together. Which includes KB107 .030 over pistons and filing the rings to get a 0.032 gap. We used speed pro standard gap moly rings that like lead69 said came in out of the box at 0.018. We used a cheap ring filer from summit and a small hand file to clean up any burs. This was our first time filing rings and
it was really easy. here's a few pic's.
Richard