It's the "Any old 4-banger" part that's getting you in trouble.
There's only one direct replacement and just as Maurice posted, it's the 2.3 Lima motor. Any Lima bottom end will work and you can transfer the head and everything else for a fairly easy swap.
There's only one direct replacement and just as Maurice posted, it's the 2.3 Lima motor. Any Lima bottom end will work and you can transfer the head and everything else for a fairly easy swap.