Do I need an SFI bellhousing?

Good question, I haven't done alot of research into that yet, I kind of assumed (for now lol) that most of the SFI flywheels would be about the same quality for the given price. I'm still not sure what type of clutch I would need, or want, to run. Single disc, dual disc, etc. I'm open to some ideas and opinions on any of it!