Lifting a dually opinions needed

[rdauphinais]

Hi everyone, i have a 1986 gmc K3500 dually. I will be putting a flat bed on it, and wanted some opinions on lifting it.
Questions:

1. What spring size do i have? I'm assuming 56"
2. I can't find any lift kits for one ton trucks, will 3/4 ton lift kits work?
3. How much should i lift it?
4. Should i do a kit with rear springs? Or just blocks? Right now the rear springs are stacks of at least 9, with overloads. Pretty rough
5. What brand?
6. What else do i have to look out for? T-Case drop? Brake lines?
7. Should i keep it dually, or take the outside tires off? Can i do That?
8. What size tires? there are 235-85-16 on it now and that won't look to good lifted. I don't think.


I'm pretty much a newbie at lifting to be honest, and need any opinions i can get.
Any pictures are helpful.
None of this will be taking place right now, because the truck is outside under snow and it's too cold up here in N.H. right now. Also low on funds.

Thanks in advance,
Ryan