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That kind of oil leaking usually does mean either the flywheel housing-to-block gasket is bad or wasn't installed, as you suspected. It's an easy thing to miss during engine assembly, especially for amateurs doing their first Model A engine. It's not intuitive where it goes, so it's easily overlooked or ignored, as are other gaskets in an engine set that fit certain applications, but not all.
If you are certain the rear main is not leaking or the back lower corner of the valve cover, you'll be pulling the engine just to install this 75 cent gasket. 'Sorry...
Marshall