1968 A-Body suspension question?

The Wilwood caliper and adapter setup cures the swaybar clearance issue.

http://www.moparaction.com/Tech/archive/disc-calipers.html

Considering this is a slant six auto car that will be a daily driver I think the 8.75 rear would be overkill and expension. That 8 1/4 73 and later sounds promising. So it's a straight bolt in huh?