Gathering parts and have a few Questions....

[Atl69C10]

I am in the process of gathering all the neccessary parts to make my 69 a daily driver. I purchased a new oil pan, new fuel pump, pads and shoes, and a real seal for the 3spd trans. My first question is the truck needs a new radiator, it currently has a 3 row radiator and I would like to put in a 4. Will this require new brackets to hold the radiator in? If so, were can I find them?
The second question is, I would like to install an electric fan. What brands have people had good luck with and what is the best way to a temp switch? Also, I plan a putting A/C in the truck, does this mean I need to use a dual fan setup? Thank you for any help you can provide