kevin,
I've fixed several radiators before just get the big .025 Solder Rolls With Rosin Flux Center 60% Tin 40% Lead-Rosin Core. Get some acid rosin, clean the area real good with a wire brush, slap some rosin on it heat it up with your brazer tip, after it starts to turn colors (light red) move the tip away and add the solder. It should flow into the area pretty easily. If its a big hole, you may want to try and make it smaller by using needle nose pliers to crimp it down to a crack.
Hope this helps, it's worked for me several times. I did a 65 Mustang radiator back when I was 16 and it lasted for a couple of years. Then I lost touch with the car so I don't know how long it really lasted.
Here's a web site for a place in Santa Ana, but you can probably find everything you need at a Sears or other good "Hardware" store.
http://www.action-electronics.com/kester.htm#Wire
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