I have no clue where you are, if you were close I might be able to help.
I've owned Champs, great vehicle to drive, very smooth ride.
If it runs well the engine will last forever, or until some one starts doing unnecessary work to it!
The engine is a RR design, but only the first few were actually built by Rolls, later cars were assembled by Austin.
The RR engines are just a fraction different than the Austin engines, mostly thread pitch and nut sizes.
The Champ has fully independent suspension, using torsion bars.
The suspension parts are designed to interchangeable for all corners.
The trans synch-roes wear fairly quickly, so shifting is leisurely, but with the Champ engine torque it's not much of an issue.
Some of the waterproof seals are no longer available, tons of Champ spares were dumped into landfill's when the MOD stopped using them.
A Champ engine cost the MOD as much as an entire Land-Rover, so it's no wonder that gave them up.
If you get a good one, and are fairly wealthy to maintain it properly, they are great vehicles.
If you are young, poor, or not mechanically talented, do not get it.
A friend of mine in Kalifornia has all my old Champs, plus another, so I think he has four.
ONE runs, another could run with some work, the others are parts.
He could probably take another if it is mostly intact.
How many here knew that Sir Alec Issigonis (Designer of the original Mini) was involved in the Champ design?