Bitchin truck!!8)
I had one for 10 years. My mine was a `73 with an `82 front clip and doors. I took it down to the frame rails and back. Fully caged and custom bumpers. I sold it 4 years ago like an idiot!!
Here is a pic of right after I got it finished....
I wheeled the crap out of that thing!!
I have had quite a few of these things. I still have a about 3 sets of step side fender! I have the dash piece you are missing and it's even blue!!
I have 2 early 4wd 518 trans (the full hydro version) and some small parts.
On the frame question....
They are all different. But they are the same from the front crossmember to the front cab mounts.
I miss my truck!! I have been looking for another one but when they pop up I never have the money!!