You gotta be careful... get what you pay for. When I sell an engine, I have driven the vehicle, made sure it doesn't run hot, no smoke/knock ect.... Pulling something from a junkyard can be risky sometimes.... Unless you plan on rebuilding it anyway? from the way OP posted, he is looking for something to drop in and go?
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Sn95' Tripple Black Cobra
Mods:Heads/Cam/Intake/Exhaust...just your typical stock mustang...