That particular one look more like ones GM used at the carb inside a screw in housing. There would be some indication of a hex nut/bolt or it may have unscrewed entirely off like an oil filter and the metal had external threads into the bottom housing of the fuel pump. Egad - my memory is pretty good but that had to be some 35 years ago an one broke on me or wouldn't thread in (the housing) and those were in stock as it was common I guess.
Is there a nut or anything dead center on bottom of this bowl? On the bright side - if this breaks or leaks somehow a fuel pump for a newer straigt six Ford will probably fit right in if stuff is hard to find. "Google Images" and Ebay are a great source for pics of just what you want and the pics frequently are links to the parts. Stuff is available for this with no doubt,
T
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Tom Greenleaf - MetroWest, Boston