themadscientist wrote:Get under it and check major bolts for signs that they were removed and replaced. Motor mounts, transmission bolts, wiring plugs etc. If they are still covered in years-old crud he's being disingenuous. Have the compression checked too. If the motor's compression is low the milage may not be.
QFT!
Do this^, its probably the only way youll be able to tell if the motor was taken out. Whether the motor has miles he specified i dont think can every be tested, just take it with a grain of salt.