Radiator/hose/block temperatures

[Ritchie Labate <rlabate@sbcglobal.net>]

Hey everyone,
   
  I'm trying to diagnose some overheating on my '68 2000 (Stock engine, 
electric fan). The temp guage usually passes the midway mark, sometimes 
approaching, but not reaching the 240 mark, then I shut it down.
   
  Using an infrared thermometer, I measured the following:
   
  Radiator- 205'  throughout various locations
  Upper/lower rad hose- around 190'
  Engine block- 225'
  Valve cover- 170'
  Thermostat housing- 190-200'
   
  Questions:
  1. what are normal temps for the above? Radiator?
  2. theoretically, should the thermostat housing register the same temp as the 
preset thermostat? (ie 160 or 180, I don't know whats in there)
  3. is the engine block temperature really that high?
  4. where should the temp gauge register under normal operation?
  5. where do I start? new thermostat, recore rad?
   
  Thanks, folks!