What manual transmissions were behind the magnums and do they fit into my car

Hey all.
I am in Australia and currently building a 360 Magnum for my 1972 charger. I would like to make this one and manual instead of an automatic. Can anyone tell me what manual transmissions came out behind the 360 Magnums. I would like to know if they will fit into my car or do I have to modify the tunnel. Are they a strong gearbox as well. I'm Coming to America in a few weeks time I would like to purchase one but I need to find out if it will fit first. Does anyone know the width, length and height of one of these boxes. Any help is greatly appreciated