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The Model A transmission usually leaks out the rear from two places. One is from around the cluster and idler shafts. This can be dealt with in two ways. Suppliers sell a little casting that bolts over the end that will dam up any oil coming from around the two shafts. This remedy can be done without pulling the transmission. If the transmission is out of the car for overhaul many suppliers sell both shafts with O-rings installed at the back end. This will prevent oil from leaking around the two shafts.
Another area of leakage, and from your photos this is the one you may have, is oil can easily migrate under the rear ball bearing along the six flutes in the main shaft. What prevents it from passing into the U-joint housing is a special washer that is wide and has a notch in it. This washer fits up against the rear of the main shaft and the rear of the U-joint. The notched drops into one of the flutes on the U-joint. The washer is used in conjunction with the bolt and lock washer used to mount the U-joint to the end of the main shaft. Quite often this washer is missing or has been substituted with a flat washer with a smaller diameter. This will cause oil to fill the U-joint housing and eventually drip on the floor. If the grease seal that sits behind the roller bearing in the torque tube is shot oil will continue down the torque tube and eventually end up inside the differential banjo.
This is not an easy fix as you will have to pull the rear end back to get the U-joint mounting bolt out. Most suppliers carry this special notched washer.
I don't believe replacing the gaskets on the U-joint housing will solve your problem. The U-joint housing is supposed to be filled with grease. If you have oil dripping out of it, it is coming from the transmission down the main shaft.
Tom Endy