241 hands down, I run one in my jeep with 39's. it will be much stronger than a 300, IMO I think they are the next step below a 205 or any of the "2" series case's.
The nice part about a 241 or any HD ALU case with a chain is the housing can flex under load, that's why they put them in one tons threw the 90's even behind the diesel trucks, Dodge and Chevy.
With that adapter and maybe some hole mods you will be able to adapt a 32 spline pass side ( or driver drop with a lot more hole mods ) to a 32 spline input 241.
1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.
And on the 8th day, God created the 14 bolt....