What is the unit called that screws into the passanger side of the block and has two leads? This is on a 70 with a 350 engine.

It's the temp. sensor for the TCS system.
http://www.nastyz28.com/ubb/Forum24/HTML/000519.html

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Charter Member - WFO Club
1971 Z28

http://ca.geocities.com/mlvd@rogers.com/images/TCS_temp_send_unit.jpg

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Mark D
1970 Z28
http://http://ca.geocities.com/mlvd@rogers.com/ (http://ca.geocities.com/mlvd@rogers.com/)
WTB: 70 SS396 Chevelle 4-spd, flapper hood car, no rag tops, 1-2 owner car.