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.
just because the ECU goes bad doesn't mean you have to change to an HEI setup. thats alot of wiring for nothing
simple replace the ECU box and done deal if thats the problem. I can't stand people saying mopar ignitions are junk, but truth be told most ECU boxes are 30+ years old and still running the vehicle!
