Thanks everyone for the encouragement and nice words.
Made some more random progress.
Took apart the inside to clean out the tank..
The inside of the tank was perfect despite the old gas in there.
The outside of the tank had some surface rust corresponding to the felt spacers.
The floor pan had some surface rust underneath the felt too.
Cleaned both up then used rust converter then sparingly covered in a quality epoxy.
The history lesson on the floor pan was interesting..
This Wyoming rancher liked poker, cigarettes, and beer..good trifecta.. Lots of old pull tab can tops and some miller bottle caps and several matchbooks from some laramie "points of interest" were found.
Meanwhile there has been an ongoing war between me and the egr system.
I had a couple egr sets i have been acquiring. So I have been using components of each to try to make one usable. I needed the manifold pipe off this one but after a week of heat rust penetrant wax a 4 foot cheater a new expensive wrench and lots of fruitless effort..
Mike came over and assessed that the shock was being lost by the movement of the wood bench mounted vise.
We took it out front and parked a tire on it and eventually the 4 foot cheater and new 1 7/16 wrench (36mm wrench not available quickly) got it loose.