The answer would depend on whether the IP was removed and reinstalled into the vehicle prior to the check.

It would also be beneficial to determine if this IP as the 17mm port on the side (down near the bottom of the IP, just aft of #6). A photo of this area would allow a quick confirmation.........or not.

Should give a few details of the failure. For example if the timing chain let go at speed or whatever. Helps to indicate how to suggest checking better. For example is the pump on the right cycle?

Since it is a 1983 I imagine you do not have the timing port to use the appropiate tool in.

#6 ???

...........#5..........

Here is a photo of the port, if it's present: