On the sender, best you can do is try it out by ensuring the flange stays still and float of both units when at full position starts at a fixed reference point. The top of the float at the full position should be almost the same height as the flange to reach the top of the tank. If the stops for the float arm on the sender body are fixed in such a way that even though the arm is shorter, the float moves the same distance as it drops to empty then it should be OK. If it stops short on either end you may need to cut the arm wire and lengthen it to match the Packard distance. You can do this by using a butt splice type electrical crimp connector. Just be sure to remove the plastic over the connector first. The results will be similar to what the Packard sender mfg did to attach the longer arm. If measuring with an ohmmeter, when at full position the reading will be approx 10 ohms and when empty, around 75 ohms +/-.
On the gasket,
MaxMerritt has them if something suitable is not available faster at Napa. It is an ordinary O ring although it does need to be of fuel safe rubber. Napa might have something listed for Ford products.
You might also think of cutting a hole in the trunk floor in case you do run into problems and need to change it. So much easier than needing to drop the tank again. I believe the dimensions Ross posted for the hole in a 51-4 model will also work for 55-6.
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