Where the crank is rubbing the new slinger did the crank come in contact with the original one? How much end play do you have? Model A is .004-.006" if the babbitt was done correctly. Model A will leak with excessive end play and also if it can't breathe, If the oil filler cap has steel wool or something to restrict breathing it will come out rear main.
As an example I have enclosed two pictures of what the rear main do correctly should look like. Yours will also work as the cut the grooves by hand.
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