Sooo I got a fiat 124 1976 with a rx8 rotary in it and obviously the stock 124 rear end is not up to that challenge. This is first car I've even owned with a solid rear end. So, which rear end to choose? Definitely need a LSD and the car will have about 250 horsepower.
Subsequently how to go about it? I made the subframe for the rotary, is a rear end swap much harder?
has coil springs in the rear, the spring perches look like they would be the hardest part
Ford 9-inch. Big wide one, make the wheels stick out the sides. Then you've got an excuse to add box flares. 
A Ford 8.8 would be my vote. A stock one out of a Mustang GT would be more than enough to handle the power you're making, and it's not as big and heavy(power robbing) as a 9 inch. Stock LSD too.
They also vary in width depending on the year, I would think one out of a foxbody would get you in the ballpark. Plenty of cheap brake options too.
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