you are facing a difficult situation

I would try the followings.

Is there any loss of power? Are the compression in cylinders OK?

How look your plugs? Is there ignition?

Is there any fuel flowing from vaccum line to hose valve cover to air filter?

With motor off does it stronlgy smell fuel in the airflow meter
in normal way fuel goes to injector only to my opinion there two locations for a leak on the bottom part of the fuel distributor or the membran of the fuel pressure regulator (no smell should be in the air flowmeter)?

good luck