1986 GMC Astro rebuild...questions

Better look at that rear damage...

 

No Tach...but as you'll see in posted Specs from visor it lists "Tach DELETE"...

 

Headliner has some kind of cushioning left but nothing else. No way I'm talented enough (or rich enough) to put her back in perfect shape but I feel like I can make it look a little more decent...

 

Still trying to learn what and where components are, and their functions (if out of the norm)...fuel filters here but I'm confused on the many lines--three on each. I can understand IN and OUT but where does third line go?
The other pic I don't know yet what it/they are...maybe a water separator and ??

 

Here are those Specs that are posted across the driver side sun visor...some I can understand but most I'm still trying to figure out. Interesting are the "Kroger..." options...I'm guessing it was a Kroger truck at one time? LOL. I did speak with another former owner that had it around 2004. Used mostly on their yard moving stuff around at a petroleum plant. In his 70's, he got a kick out of hearing about it again and said it had a great motor in it. His memory thought it had polished aluminum tanks on it, (nice black gloss now) and no idea how the 24.5 tires and wheels ended up on it.

 

I think some are hard to follow with cab down and that is yet another problem I'll have to deal with..previous owner said it would jack up part ways then no further. From my readings I'm thinking maybe I can rebuild it with new orings and such...could be lift cylinder too I suppose...

 

Well, thanks for the looks and input everyone, and please keep 'em coming. I'm headed back outside here at midnight to see what else I can dig into haha...