[Lady72nRob71]

What temp are you seeing? Gauge functioning correctly?
IR thermometers are great for verifying this.

How much air are those electrics moving? I have heard of many of the electrics not having ample airflow for high CID engines.
When standing at the left fender with the hood open, look at the fans. There should be a hot enough blast to make you squint your eyes and make your hair blow. This is what a belt driven fan does when the clutch is fully engaged.

When was the last time the block was flushed WITH BOTH block plugs pulled? A lot of crap can settle to the bottom of the block.

The stock water pump should be able to maintain 192. Simply cutting power to the electric may then just cause a restriction.

Is your radiator fairly new? If not, pulling it and reverse flushing it may help clean it out.

Is the timing set right? Vac. advance working right? Fuel mixture not too lean?

Just some ideas...