your o.k. and it's simple. 1963-72 A-bodys were small bolt pattern which is 5x4 bolt pattern and uses 7/16 studs. 1973 to 76 and most all other moparts in this 60's and 70's B-body, E-body and C-body used large bolt 5 x 4.5 bolt pattern and used 1/2 studs. When you do your conversion you will need to upgrade you wheels to that larger bolt pattern wheel. What makes this conversion so popular is that wheel choices become 100% easier in all sizes. 14inch threw 20inch. Only down side is that if you had your heart set on running the 13' wheels offered on early a-bodys you will be out of luck...lol
Good luck with your build and I think the Wilwoods make a nice brake system. I am considering the same conversion to my 68 barracuda S....
