At this point I think the best possible plan for this thing is to keep it exactly how it is, fix or replace the engine with another F-head and just get it back to running and driving safely (the steering needs work), go thru the brakes, drivetrain, wiring, etc. I found an engine rebuild kit for $900, but I don't know how damaged this engine is and if it's even rebuildable. I did find a buddy that's going to 4.3 swap his Flatty and has a good F head that should be available soon.
I doubt I'll put a locker in it or wheel it as hard as I wheeled my CJ2A, lack of a roll bar, the custom hardtop I don't want to ruin and bench seat are all reasons not to. Plus, the massive gas tank that hangs down under the body on the drivers side. I don't know that I want to beat the crap out it.... but we will see. I would take it on more mild trails though, but probably not Cliffhanger, Moab Rim, etc.
It would be nice to put some appropriate wheels and tires on it, I like the steel wheels that it came with but they're 15's and I believe 16's are more original. I don't know about NDT's, but
@Hickey pointed out the wheels & tires Fred Williams put on his CJ2A and I dig the tires. They're
Firestone Knobbys, old school skinny bias ply. I'd need 16" wheels at that point.
I think this is the best overall plan... maintain the character & history, don't ruin it with unneeded upgrades.