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Re: Suburban runs, only with key in start position
The original wiring scheme for GM vehicles with points has a resistor wire running from the keyswitch to coil+ side providing less than 12 volts (nine I think) Another wire fastens on the coil+ terminal that comes from the starter solenoid to provide full voltage while starting.
HEI requires full voltage while running, so the fix of running a 12 gauge non-resistance wire from "ignition unfused" at your fuseblock to the HEI terminal should have solved the problem.
I'd next check to see if twelve volts is constant at "ignition unfused" ,then at the HEI connector with the key turned on to the run position.
I suspect the keyswitch, but if you have power all the way to the HEI plug, then the problem is the distributor.
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