[83swb]

As far as the frame paint goes I've had good luck with POR15 on my daily driver F150 that I went through, second salty winter and nothing has even started to show signs of peeling etc. But after plenty experience with POR I'm on the same side as you, way over rated, a pain to work with, and its hit and miss as far as durability.

On my C10 project I went with an etching primer and a cheap fleet grade black enamel paint, I'd imagine its the same stuff they paint "large car" (semi) frames with etc., and it was only $40 for a gallon with primer included. I really like it so far but the truck isn't on the road yet and it won't see treated roads so only time will tell, it sure is pretty though.

In my opinion a rubberized bedliner coating belongs just there, in a truck bed. If you go this route you better make sure every last bit of hardware is off the frame, and you leave cross members, shackles and whatever else is hanging off the frame intact. If not then your bolting all of those up and samwiching an 1/8"+ of gooey rubber **** in between them.

As far as leaf springs go, the less leaves you have and the milder the arch, the better the ride. The opposite yields an obvious result. But, I don't have experience with lifts so I can't tell you much more than the basics.