Unknown. Odometer died a long time ago. PO guessed 150k.

Rovahfarm has many of the 3.5 internals you may need to piece the motor back to life. Rover was very good at keeping their motors using the same guts, just the displacements changed. Lifters for example are the same on all petrol from 72 to 04. They also have the 3.5 valve guides which you’ll probably need a couple of. Push rods haven’t changed either. I’d have the heads shaved and have the shop install the guides and valves you’ll need and rebuild the rest myself, pretty easy. Rovahfarm even has the 3.5 steel head gaskets. It would run well enough you’d be disappointed in the gutlessness.