17 and Buying a Truck! '72 C20 4X4

[Cam-Shaft]

So I am 17 and buying my first truck. I have a deal worked out for this and will be picking it up within the next few weeks. It is a 1972 C20 with the 327 and Manuel transmission.

Some questions I have:

1) Why is it four wheel drive? I thought C stood for 2 wheel drive, but it is obviously four.
2) Why is the grill kind of unuiqe? I seem to find another truck that has the chevy emblem on the hood instead of the grill.
3) What transmission does it have? I think its 3 speed with a granny? not to sure on that.

Let me know what I've gotten myself into! I like the look of this old beaut and look forward to learning more about it.