rad and fan!

alright! I am putting a built 360 in my 73 dart sport and i would like to upgrade the cooling system! I would like to put a bigger and or better rad in! is there a stock rad from another vehicle i could use? I heard a rad from a half ton truck of some kind would work! Also im am planning on going with an electric fan! what size should i look at and should it be a pull or push fan? Thanks for the help everyone!