No Fuel Pressure after driving car.

That sending unit looks repairable. There's 3 places I know of that do the restorations if needed:
Fuel tank sending unit rebuild service
Rebuilt Fuel Sending Unit Specialist
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You might be able to get away with just replacing the float:
Amazon.com: Omix-Ada 17729.01 Fuel Tank Plastic Float: Automotive

and the strainer sock:
Amazon.com: ACDelco 5651705 GM Original Equipment Fuel Pump Strainer: Automotive

Yes both of those will fit, I use them on my OEM fuel sending unit. They work perfectly.

See additional info in this thread:
Fuel tank sending unit for 1966 Dart?

EDIT:
Oh also the Chrysler part # for a new sending unit gasket is 6031475...but it seems to be cheaper to get Dorman 579006 which is a new gasket and lock ring. Do not throw away your OEM lock ring, often times that's the only one you can get to seal properly, even if the new tank came with a lock ring.