C20 to K30

[72c20]

I have a 72 chev 3/4 ton 2wd, i pulled the ifs and i now have the dana60 sitting under there. Im wondering what the best way to center and square the axle is since i have to mount it myself. I was thinking of leveling the truck, and plumbbobing down the center of the fenders, and then check off of some factory holes on the frame. It looks like the leaf mounts should be inline with the rad support mounts. If anyone has any ideas, they would be greatly appreciated.

The springs i have now read 44 3/4 in. unweighted center to center, they are 80's style 8" lift springs.

The main thing i need to know is the hole location for the front of the leafs.