I highly doubt that you're going to find a 289 crate engine anywhere. Can get a 302 from a couple places that come to mind.
Was it me, and there are reasonable junkyards near you (wherever that is), I'd go looking for a 5.0 Explorer. Unless you've no intention of going EFI at some point I would grab the WHOLE engine, wiring harness, PCM, everything. If no intention of future EFI then just grab the long block. Clean it up, install your front drive stuff, oil pan, etc, and run it. You will need a flywheel if yours isn't an auto trans, and your existing flywheel won't work.