sounds stupid,but are sure the rotor is turning while cranking? i had a dist gear/shaft fail once.
sounds like maybe the wiring to the orange box/dist/car is an issue? do you have a FSM? or wiring diagram to ck all the ign wiring?
some times i use a dist hooked to the system,but in my hand,and spin it,to see if the system is working.is any of the parts to be known to be good,from before?
ck pickup in dist,vs reluctor for clearance.should be .010 or less w/o hitting.
look into the tech archives for wiring,and electronic info,here is the wiring dia from there click on the link. http://www.moparts.org/Tech/Archive/elec/3.html