I respectfully disagree that it's not worth it especially given that he got the car for free.
Low mileage used engines can be found on Ebay for as low as $700. Mine was $1025 and that included shipping to my front door.
Pulling the engines are really easy....remove radiator, tranny cooler and fans, disconnect engine harness from fuse box, ecm, O2 sensors and tranny
, remove all 6 exhaust manifold bolts from catalytic converter, remove bolts that connect tranny to engine, remove starter, unbolt A/C compressor from engine, remove the two nuts on the engine mounts. Now pull the engine and install in reverse.
Approx an addl $200 for spark plugs, engine oil, antifreeze, power steering fluid, plenum gaskets, 2 copper crush washers for the power steering pump hose and the 2 gaskets that goes between the exhaust manifold and catalytic converter.
If you lose any tranny fluid while the hoses are disconnected from the tranny cooler it will cost you about $150 for the dealer to do a drain and fill to top you off. Unfortunately it's not easy for us to top off our own tranny fluids do to the fluid must be at an exact temperature while the engine is running while it's being filled......oh and we don't have a dipstick
So I would jump on the chance to own a low mileage V6 for less than $1500 (if you do the work yourself).
$3000 ($1500 engine+supplies+$1500 labor) if a shop does it.
$2100 ($1500 engine+supplies+$600 labor) if a good shadetree alley mechanic does it.
Please please change the rear diff fluid. Nobody seems to do it. It's easier and quicker than changing oil.
A used running/well taken care of V6 with comparable mileage may run you $5000 - $7000.