Shoulda bought the kit before you spent all that on replacement hardware but the answer to your questions is "get a BBK"
I ran stock with XP10 once I got "track rubber", not even serious rubber, RE11A. I saw a dramatic increase in pad wear. Bought the kit after that. If you are melting XP10 it is a no brainer.
Not sure on the wheel fitment but there is a thread on AP sprint wheel fitment and you can print the template and check yourself. If not fit you can do extended studs and spacer or obviously buy new wheels.
Thread:
http://www.ft86club.com/forums/showthread.php?t=64282
Template:
http://www.essexparts.com/storage/wy...l_template.pdf