Hey welcome to the board. You acme to the right place for answers I could find my t-stat or temp sensor when i got here just check out this thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=244492
I'm betting that temp sensor is on the drivers side manifold of that 350 if you need me to I'll take a pic tonight. looks like a mini spark plug. if there is no wire on it.
Heck this next thread ought to make you laugh. I felt stupid as a rock after they pointed out the obvious and nobody out here made fun of me. They just helped out.
http://67-72chevytrucks.com/vboard/s...d.php?t=250799
Welcome again and let me know if you need a pic. -J