Your pics take me back....now mine's got a ton of brush "pinstripes", a couple dings, and other imperfections on every panel - part of the reason I bought the LX450 is to get my black one back to super "street queen clean" - might even just put all terrains on it next time, that's how much I want to keep it nice for when I get reeeeeeaaal old - so I can have a 30 year old 80 we look at like when you see a cherry 40 nowdays.
I don't blame you in the least for not off-roading that thing, it's too nice to get bashed like most of us have done. Grease those bolts & like others have said - POR-15 paint on the underside will keep the salt issues pretty well in check, I'd even leave a gardenhose/lawn sprinkler (the arched arm type that shoot verically back & fourth) setup just to rinse the salt like how you get super gobbed mud off an underside, once each freeze session is over.
I know it sounds pointless, but really grease all the suspension bolts, especially if you add a small lift - and all the threaded steering components too (tie rod ends & the threaded rods) - doing this will make this near THE benchmark 80 all the rest of us with our dented, rusted, smelly, worn & loose 80's would look at & think back to what alot of us started with.
At least my black ones' interior is really nice paint needs mega work though, but the LX450 is never going to be nice again - so I hope you really do keep this as a "streeter" more than anything, it's just so nice to go do the kind of things so many of us do with our 80's.
As nice as yours is, it'll be tough to find a replacement in even a few short years - think how many of us have done things that are near irreversable to ours - making ones like yours a desirable unit because you didn't beat on & add all sorts of funky stuff like us who will be hunting for things we can cannabalize in the near future.
Some may think you "need" _____, but yours just as is cool, and 305's are just small enough you don't feel the need to regear, and it's all a slippery slope from there. Here's hoping you keep it just as sharp & near factory as it sits!