Crank position sensor.

The sensor picks up a feed from the rear of the engine under the oil filter. There is a cable that goes to the EZL. You can measure the resistance of the cable. Cool and hot it should be between around 800 - 1100 ohms. If the engine stops measure the resistance of the cable straight away - they breakdown under heat.



Don't put those platinum plugs back in. Keep the coppers gapped to .08mm.
Make sure your fuel filter are changed - there are two - one back by the fuel pumps and the other in the input to the Fuel distributor.
If your Crank Posi sensor checks out O.K. check your coil.
Of course you have changed your Fuel Pump Relay? These will fail and give exactly the symptoms you have described.