Still working on the same project with a '66 Chevy II.
What I did:
Level the car on jack stands, left to right, front to rear, front and rear, left and right. This is a long process in its self.
Plumb Bob both front hubs and back hubs. Mark a cross (X) point from LF to RR and RF to LR. This point should be half the distance from front to rear and half the distance from right to left.
I was able to adjust this point to 0/0 with the 4 link.
I'll let you know in a couple months how it works out.
Steve