Great feedback...
Bartamos: the 283 block decodes as a 1967 C10/K10, the heads decode as 1957 Corvette Power Pak heads, the modern aluminum intake I installed is a Summit Racing model which only has a heater hose port and temp port. Yes, I plan on using a fan relay and using a fan sensor of some style. I already know a I have an overheating problem. Sitting still, idling for 15 or more minutes will cause it to overheat. The radiator is one I purchased from Classic Parts of America 7 years ago. It is an all aluminum 2 core with 1" tubes referred too as an desert cooler. I believe it was built by US Radiator. My mechanical fan is a 17", 5 blade fan and is installed 1" from radiator core and looks just like a 1957 Corvette model. I think my cooling problem is 1) fan is not vertically centered to the radiator core 2) Not having an appropriate shroud. US Radiator has assured me that their SHP-16 fan/shroud assembly will take care of my problem and A/C. So, I will be removing my mechanical fan. The timing is set at factory spec. I'm currently using a hotrod style shroud which I think is next to useless. Moving say 30mph or more any day, any speed (well, I have not been over 80mph) is no problem.
Why wouldn't the water pump be a good choice?
How is the radiator drain hole used? Isn't it an 1/4" fitting.

Gazim: I am aware of that style of sensor, however the electric fan and shroud Spal is building for me covers the entire core surface. The sensor would have to be inserted from the "front" of the radiator. I have read somewhere this style of probe should be inserted from motor side of radiator. My preference is to use an adjustable sensor.

Thanks