Yeah I actually tried Silman's. Discontinued. I've found a few different dealers that use that same interface and for some reason they all seem to show all parts as in-stock for whatever reason.A hard restart after sitting overnight might be a fuel pump check valve failing? If the rails & lines drain from sitting, the pump has the prime the system at the next start. This will be an extended crank-time to start. The check valve is serviced with the fuel pump, but I have seen in-line check valves spliced into the supply line.
One way to check for this is to roll the key to 'run'. you should hear the pump 'whirr' for a second. Turn the key off and proceed to then start the car. This initial priming of the fuel system may help starting.
It looks like the 3.3L to 3.8L was a running change during 1991:
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The automakers were experimenting with recyclable plastics during this time, with mixed results.
Googling 'Mopar 5263102' & 5263103 showed some hits.
Sliman's shows both fillers. Inquire first.
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I'll give that a shot on the fuel sending unit though!