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how do i tell if it has a 9 bolt
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Umm... You
could count the cover bolts. But if you're like me and run out of fingers or get confuseled before you get to nine, you could just look for the rubber fill plug on the rear of the stamped housing cover (the one with the nine bolts holding it on).
If you're lucky enough to have scored an Aussie axle,you may want to keep it. It's just a wee, tad bit stronger than a 7-5/8 10-bolt Saginaw axle. Unless you can get a Zexel-Torsen differential in a 8½" housing 10-bolt, it's not worth switching. Then again, parts for the 9-bolts are not as common either.
As for the boxed LCAs, it's very easy to cut a filler and stitch weld it into the factory LCAs, then install polygraphite bushings. Converting the factory "track bar" (panhard rod) to a accept adjustment is just as easy. Don't overlook the torque arm and mounts (both ends).
You might also want to compare Spohn's SFCs.
A STB and "wonder bar" are great if you want to push the car in corners. If you're just going for 1,320' drives, they're only extra, unnecessary weight.