must be the way the earlier cars are designed. or maybe 66-67 specifically..
like i said, I put firm feel upper arms on my 67 Coronet, and it had the taller spindle for disc brakes on it already so I kept them. With the cams adjusted the way you started out I had visible positive Camber, to adjust that out I lost some of the Caster but I ended up at 2.5* Caster and got to -.25* Camber on the Pass side.
The Driver side had a little better numbers so I adjusted some Pos Caster and some Neg Camber out to get that side to match the Pass side.