newly done B-engine oiling bad.

[nuwala]

I've restored a B-Engine during the recent three month:
- honed to 0.100,
- new pistons and rings,
- new valves and adjustable tappets,
- some babbits done,
- bearing clearance adjusted,
- oil pressure holes cleaned well.
Today and I fired up the engine. It took two turns of the crank and the engine idled well.

Oil started dropping out of that small hole in the fly wheel housing after about one minute of idling. Another minute of idling and it became a oil stream filling up a quart within a minute. Fine, the B-engine has oil pressured crank and cam bearings.

So far I've done A - Engines without problems.
This is my first B-Engine. What could I have missed installing? Are there rear gaskets for the cam towards the fly wheel housing? Is there a gasket for the rear side of the crank?

How to find out and repair without pulling the engine again?