Ditch the Thermostat?

The more I read and think about this problem the it points towards the radiator or block having a restricted flow. The temp gauge shows that when at peak constant temp, either idling or cruising, is high. I've tested and replace the gauge (oem) and same exact temp reading (which is a hash mark not a numerical temp). New temperature sending unit results are the same.

So my reasoning is that there is restricted flow through either the radiator, block, or both that keeps this temp consistently high without an absolute boil-over. Fan shroud is another factor but putting my ear up the grill I hear and feel lots of suction through the rad. The first time I drained the coolant there was lots of rust and floating goop. when I changed the pump I noticed calcium deposits in the inlets to the block.

The more i find out about the mechanical condition of this car the more pissed I get. When I went to pick it up the shiny paint, interior, tires and rims, had me assuming that my wife picked a winner. I briefly looked under the right side tire well (which happen to have the only new tie rod end, brake line, and upper ball joint and assumed (I was Navy so know what ASSUMED spells out), that this car was sound.

Don't get me wrong, I like to wrench on my cars, and usually learn by trial and error (usually more error than trial) but this one is getting frustrating. Again, I appreciate the feedback and advice. Where were you guys ten years ago when I was underneath my bolt-on behemoth 72' Charger?