From all the sounds of it I forsee some or all of the following to be part of this engine's problems, none of which are easy diagnosis or cure.

*pistons, and or rods installed 180 degrees off
*rings installed lined up, and not staggered - should not affect noise but will affect life of rebuild
* if rings are aligned correctly you could have split liners - presume that engine was bored and oversize pistons/rings used - if not that is one source of noise- you cannot use only oversize rings, but also cans.

A lot depends on how detailed the rebuild was, what parts were used, and even if (horrors) the block was decked bolow valve/piston clearance and that would show as circular indents in piston(s)

I recall that an early B engine can have oil pan removed with engine still in car (by loosening front motor mounts) don't know if same can be done on a A.

Got the car back yesterday from the owner after the engine being rebuilt again. The car is still making a noise.

Does anyone know what in the world could cause a "cam chain noise" with out being the cam chain? I know that sounds stupid but I'm looking at the cam chain and it is new and the adjuster is extended.

Should the adjuster spring back or should it be tight against the chain?