2wd to 4x4

[chevyc1068]

First of all I hope this is the right place to post this, if not the moderators can move it. What all would have to be done to convert a 2wd to a 4x4? Is there any way of doing this? Is there any easier way to do this than to swap frames, or is that even in the realm of possibilities? I have a 1968 c10 with coil springs front and back, a manual tranny and a 350 motor. If there is any other details you need to know let me know and I'll try to get them.