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No authentic 1940 Ford passenger car radiator had the filler in the center of the top tank.
The only correct radiator for a '40 passenger car, regardless of model, has the filler at an angle and a split core.
There will always be "91A" stamped in the top tank. Some time around March, 1940, Ford began outsourcing some of the radiator manufacturing. At that time, the "91A' was stamped in the upper tank as well as other identifying markings that indicated the supplier to Ford. The radiators manufactured by Ford had "B1" stamped in them as well as either the letter "D" (Dearborn plant) or the letter "G" (Green Island plant). Radiators supplied by Modine had "B2" stamped in them and those supplied by McCord, had "B3".