Help with recently acquired 1960 W500

[Rust Buster]

I purchased a 1960 W500 from Dave Horvath, this past November. I needed it like I need a hole in my head, but it was calling to me. Not sure exactly what my plan is just yet, but I want to get it running and at least yard driving. I guess it was an oil field truck from Texas, and Dave bought it out of Oklahoma and brought it to West Virginia. I'm in Northern VA, and while I have several flat fender PWs, this is my first foray into the Power Giants. It apprently will run, and has the 318 and I believe an NP420, based on the body tag, but everything I am reading says it should have come with an NP435? 406915608_1845225659207832_8285465395021815072_n.jpg I am looking for a parts source, or swap info on the hyydraulic clutch components and brakes. I'm assuming these are unobtanium, but are there good substitutes? Are the W300 parts for the clutch the same? All the parts sources seem to stop at W300. Anyone know what carb came on these?
Many thanks in advance.
-Tim