340 engine (runs)

im not sure how many miles but it runs good and did not smoke.it sounds like its stock.i bought the vehicle for the motor one month ago.i dont know any details on the motor at all but it ran good when pulled.it will need a new gasket set because it is all oily in the front.i would at least take it apart to check things if your going to use it the way it is.thanks,mike.