Thanks for the responses and inputs guys, appreciate it, and sorry about the delayed replies I've been slammed with stuff. Yea, gapless rings are out, just seen em but haven't heard much about them so i figured id ask.
Yea I have a hand crank ring filer, the last rings I got came with my pistons, they were regular file-fit moly rings 0.035", but I'm planning on adding more power to this build so I just wanted to gap a bit more to compensate. I'll just have to decide on file or non file fit rings. I'm sure it doesn't matter, just depends how much I need taken off for how much I need to gap them. Made sure the ends were cleaned up nice and well for installation after gaps were set and squared.
Again just for learning purposes, the material of the rings, cast, ductile, regular iron... any benefits or specifics for using either?