360 will not start, any suggestions?

Dad's old 360 power wagon was doing the same thing, it would crank and crank, with fuel and spark.
The ecm box was weak, I elimanate the factory ecm and changed it over to an external gm hei unit and the truck starts quick and easy.

The hidden truth to this story is that the real problem was the HIGH Resistance in the wires. The GM cap require that a new set be installed.