Another engine for a 1993 4.0?
Does your 1993 have EGR?
Some '93s do others don't.
Either way you'll need to find a 1993 or 1994 Ranger or Explorer as a donor
And the differences determine what you'll need to swap over from your "dead" engine to your replacement...
1993-1994 are basically the same in regards to pistons and cylinder heads and injectors, but there are some minor but important differences in the details....
The 1993 is a "batch fire" engine that uses the same injectors as the 1994 SEFI engine.
The 1994 SEFI engines have EGR and the cam position sensor.
the 1993 do not
The injector harness is different as is the main engine harness (and of course the PCM is different).
some 1993s with California emissions had EGR & SEFI (always found together)
Somewhat more 1993 Explorers had it.
generally speaking ALL 1994 explorers had it, but in years of looking I've found exactly ONE non-Cali 4.0 Ranger with a SEFI/EGR engine.
Your Mileage May Vary...