Well, most older pre fuel-injection GM's have a separate engine harness and forward lamp harness connected at the firewall plugs behind the fuse block.
The engine harness basically had the ignition, starter, and sensor wiring. Sometimes the alternator would be in this harness since it was easy to wire alternator to solenoid. Sometimes the heater motor was included since the heater motor was close to the starter wires and easy to just plug it in.
The lamp harness had all the wiring for the lamps and whatever else had power on the radiator support. Sometimes the alternator would be in this harness if the harness passed close by it.
So, make the LS harness sit on the engine nicely like you already are, but include some extra wires that enter and exist in certain spots for other functions? For example, wires for oil and coolant temp gauges or a wire for the alternator idiot light.
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