i want to buy a zc from this guy for $400. he says the motor is in great condition but has been in one car in the US after being imported. what do i look for when checking the motor over before i buy it? the external cosmetics are very good and when the valve cover is removed it looks very clean. he said that it needs a cam positioning sensor?(maybe throttle pos sensor it was hard to hear him on the cell phone) i have never heard of a cam pos. sens. can this sensor be taken from the integra counterpart? the motor does not come with tranny or ecu so i plan to use my factory Si tranny and an 88-89 integra ecu. thanks for reading all of my questions--dave