Here is a typical glass bowl filter on a 47 carb. This element is paper but Packards optional filter was ceramic. All years and single carb installs mount in the same orientation -- glass bowl down -- and relative location, the only difference being the style of carbs. in the case of 55-6 dual carbs, filter is in the line just before it splits and goes to the separate carbs.
As to the long cranking, that is somewhat typical with volatile fuel and a few days sit. Many of us have electric pumps mounted near the tank and operated by an independent under dash switch primarily for that reason. Turning the pump on a few seconds so gas is pushed up into the bowl and carb before trying to start the car will save a lot of cranking time.
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