Anyway, here's the plan:
- parabolic springs and shocks
Parabolic springs by the nature of their design have greater side sway than semi elliptical leaf springs. This increases the dynamic centre of gravity movement both on curves and during off road travel. This increases the likelihood of the vehicle tipping over. You also want a roof rack which increases the roof weight by its existence and any weight you add to a roof rack raises the vehicle center of gravity. This means it will take less movement of the dynamic center of gravity to tip the vehicle over. If you have your heart set on these things I suggest one or the other but not a combination of both. Of course this may not be an issue for you if you stay on maintained forest service roads and drive slowly. Forest service roads are usually pretty level side to side.
You ALWAYS want to keep weight down as low as possible. The absolute worst loading mistake you can make is to place fuel and water cans on top of a roof rack. Roof racks are for light weight bulky stuff.
Personally I like factory springs with ultra high density plastic strips between the leaves. They greatly reduce leaf to leaf friction making for a softer ride without increasing side to side sway. However parabolics are the current rage.
- steering linkage and tie rods
I assume you mean tightening up any looseness such as steering box adjustment, loose bolts and replacing tie rod ends. If you are replacing tie rod ends take a look inside the steering and drag link tubes for excessive rust. These tubes tend to rust from the inside out and may be ready to break when they look fine from the outside.
- roamer overdrive
- 300tdi
- heavy duty axles
You already have a Salisbury rear axle which is way stronger than the axle assemblies of previous Land Rovers. The drive flanges have a tendency to wear increasing the spline spacing. If you hear a clunk between acceleration and deceleration, the drive flanges are very likely worn and in need of replacement.
If you want to go to a stronger diff carrier the ARB locker would be a very good choice for the rear and a Trutrac would be a very good choice for the front.
GBRUtah (used to be Great basin Rovers) is the best place to go from stronger Salisbury axles, drive flanges and ring and pinion gears. I broke 7 Rover rear axles before swapping to a Salisbury with ARB, Great Basin hardened axles and drive flanges in 1996. Haven't broken a rear axle since.
You will need that with a 300tdi conversion. Stay away from the Discovery engines. The stock exhaust manifold and turbo will need to occupy the same space as a 109 frame.
- wolf wheels and mudders
Wolf wheels are 6-1/2 inches wide. Discovery I steel wheels are 7 inches wide. Tyres have a max and Min wheel width. I suggest picking your tyre size first then wheel type. I'm running LT255/85R16 BFG Mud Terrains on Disco I wheels. This tyre size will work on both wolf (minimum width spec) and disco i steel wheels. (width is at middle of tyre width spec)
- a bunch of other crap to allow us to explore the greater upstate New York area.
I'm a big fan of the early Xterra slogan "Everything you need and nothing more"
Start out with the minimum amount of "crap" and only by more if you find you need it.