7 1/4 worth rebuilding?

8.25 with a SG,done Edit and you will be golden..
To recap;
It already comes with 4.5bc, and 10 x 2 brakes,
remember 3 inch tubes so you will want the bigger U-bolts and matching shock-plates ,
and the driveshaft will need to be shortened.
I can't say if your current brake cables will work, so best to get a complete unit.
SGs are not that common so it might have to be a separate purchase.

7.25s with trac-locs will work with 360autos,on the street,if you don't abuse them too often. Big TCs and neutral drops are out,lol.