jeebus @ mmw
+1y
You should have my reply by now, but either way. If you run a smaller wheel like that, just like NAVI said, you dont want to flip the lower ball joint, just run it in regular configuration, with the correct angle built into it, and drop spindles.
The size tire will depend as well, but i assume it wont be a huge balloon tire, but not a super low profile tire as well.
Taylor