I am getting a 66 ford p/u. It's 2wd but want to convert it to 4wd what do i need to do to complete this task.  What are your thoughts on what kind of parts that are needed and what would be the best?  Thanks on advance for all yall help.  

easiest way is to get a 4wd frame with the axles tranny and t-case and fit your stuff onto that frame  

whats mentioned above would be easier otherwise your gonna have to remove all the 2wd suspension from frame and fab up your own suspension, like if your using leafs find location of shcakle mounts drill from put em in etc... or if using coilovers, your links, mounts etc.... but it gonna have to be precise u know so ur axle is centered and suspenison can acutally move through all its range with out bindning or other problems..... then steering is gonna have to be again custom made, plenty doable but plenty of work, my uncle did a similar thing to his 62 gmc 2wd pickup, put about 20 inc of lift with some super long custom deaver springs up front with dana 60, crossover steering, custom shock hoops,custom shackles and hangers,  and sitting on some "small" 44 inc tsls, its about a year and a half in the making but it really close to being done now, he only works on it on spare time btw