8 3/4 guru need your help

a 9'' is a ferd and dont really like the idea of puting ferd parts in to plymouth

-so a back brace !!!
-billet yoke???
-will I need new main like the one mark williams are making
http://www.markwilliams.com/detail.aspx?ID=609

for the third member it self I have both

742 and 489 case
wich one should I bilt???

AL thru bolt case if you want no problems