Roy, I hope you don't mind if I jump in to help.
David, everything he said makes sense. However, I am confused. Above, you indicated it started for about 7 seconds when you use starting fluid and in your last post, you indicate that starting fluid doesn't work. Can you confirm?
As far as timing, if it is the chain, compression wouldn't be high. If it doesn't start with starting fluid, then there is no ignition spark (where on the distributor did you check?), If it does start with starting fluid and then stall, it's fuel related and even though you have the correct pump pressure, the injection system may not be getting a signal to inject fuel, and so on.
Also, have you checked for diagnostic trouble codes? If there is a problem with the injector system, it could be a few different issues. Keep in mind that even the oil pressure switch on this vehicle can shut the engine down (injection) if oil pressure is too low.
Let us know.
Sunday, June 14th, 2020 AT 6:59 PM