Magnum heads on a 74' 318 LA

Hey guys I've heard and read about putting the 302 series heads on a 318 and getting super performance when done right. I have also heard about putting Magnum heads on one and having better results with less machine work. Are any of you aware of this mod? If so, any suggestions or article or post links? I have a very strong 318 LA in my 74' Duster, but I want to do this head conversion along with a good cam set-up. Any suggestions please let me know. I'm not putting a 360 or Hemi in it. It seems that's all any one says to do. That's not my cup of tea. I want to do this on a tight budget.