Strange S60 Rear End Help

I use the Super Stock (OEM) Leafs. Hope that helps to get me headed in the right direction.

I can mount the raw 440 block and transmission in the car, then put my crank, heads, intake, etc... and other engine pieces on top of the block, and find my driveline angle using a straight-edge from the tail-shaft center on the trans, to the pinion center at the rear. Would that help?