first check for if its been in a crash.. duh... then if they did any mods, you have to check if they cut any wires up or n e thing. N/a motors are usually pretty damn good, just check for oil leaks ect and how it runs. A NA motor in really good condition you can get for like 300$. if the body is clean, interior is not all messed up, and runs good, your gonna be in good shape.