Hi russellaporter3,
According to my maintenance book, your ignition system is HEI (high energy ignition). I've attached a pictorial diagram out of the Haynes Repair Manual.
It shows that the pickup sensor goes dirrectly to the ignition control module.
You should be able to take the signal measurements there. It also shows the connections to the PCM (powertrain control module, or just the computer).
You should also be able to measure signals from it to the ignition control module. It will also be a low level signal.
To take the measurements while the connectors are connected, you will need to back probe the connectors. Use straight pins from a sewing kit pushed beside the wire into the connector until it makes contact. Unplug the connector and use the ohm meter to be sure you have contact with the pin.
For the pickup sensor, use a pin on each of the two wires and measure the AC voltage between them. For the other measurements, measure form the pin to ground ( a bare place on the block or the negative battery terminal).
Hope this helps.
Best regards,
Mack1
04s10ign 001.jpg