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Then you have no voltage going to the ignition coil when the key is on start, just when the key is on run.
Do you still have the original contact point distributor or has it been upgraded to electronic?
Is this the bas, and which engine is this and it is auto or manual trans?
I believe the power wire to the ignition coil for when the key is on start comes from the starter relay on this vehicle and it should be the thin brown wire at the starter relay.
You have to check when the key is on start, cause from what you explained that is when you have no spark, isn't it, when cranking.
Did you get that wire checked?