Here we go. I need information about water pumps, pulleys and fans used on the 216 and 235 chevy engines. Which fans go with which pulleys and on what size of engine?

I have a 1950 Chevy Pickup with a 1956 235 engine. I know I need the short shaft water pump, but I don't know what size pulley or fan. I have seen them in almost every combination. (Probably not a good thing). I have also heard the term cavitate or cavitation...I need to be straightened out on the subject.

If someone could explain all this to me that would be awesome.