Your feeling the contact is not good is probably right. I have never seen any illustration of that particular sender though, and frankly, have not been all that successful in repairing them. I haven't found a way to bend the contact reliably without removing the slide from the arm to get the angle on that tiny piece that makes the connection. As you know, the contact appears to be riveted or peened on. There are people who advertise they can repair, but I don't have any info. If you try and succeed, please share your secret.
I believe the ohm range (78Ω E - 10Ω F) on the later units is about the same as yours, but mounting is different. If your range is within those numbers or the one off your parts car won't work, one possible option is the Ford-Chrysler universal sender for $25 and a couple hours work.
http://www.jcwhitney.com/DATCON-INSTRUMENT-ADJUSTABLE-FUEL-LEVEL-FLOATS/GP_2005714_N_111+10201+600002072_10101.jcw?showCustom=0
I did it on my 56 and it works beautifully. The write up is in the tech tips articles section.
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