[Gray Ghost]

Yikes...the loud banging isn't a good sign. Sounds like the bottom end isn't happy. The tapping could be pushrods...had that happen once myself. Most rebuilders re-use valvetrain components and I hate that they do that. Mine had the original pushrods re-used and they were coming apart at the top. I had to replace all of them and several rockers.

The leaks aren't normal at all for a new motor. The tapping could also be an adjustment, so I'd take it to someone to check it. But the loud banging usually means connecting rods or pistons.

You could drop the pan to see the rod journals for wear...shouldn't be any this soon, but if there is a big problem down below it might show up.

As far as the oil usage and smoke...that usually means rings...one of them might not have seated correctly.

Hope it's all easy fixes and that the motor builder stands behind his work.