I have 1997 Mercruiser 3.0LX and the timing pointer has completely rusted off. Where can i get a new one? i have checked with the auto parts stores and their is not a GM 3.0 engine for a car to match. I found a 3.0 at a boat salvage yard, but he would not sell the pointer. I can find TDC easily, but I cannot get the timing right because there is no pointer. The engine sounds like it is running good, but has considerable run on when shutting it off. Please help