"Stage 1" is an unofficial name, as stage 1 of the Land Rover re-invigoration which saw the Defender/110 and eventually all the newer models. The Factory name is "Series III V8." As mentioned it has the Carb 3.5 V8 out of the Classic Rangie of the 1970's. Essentially the same running gear as the 70's Rangies and then the County's (though theres an extra joint between motor and gearbox).
The bonnet is identical in appearance to the Deefer one. I think NM's "RR" comment comes from the raised side rails - the previous bonnets (including the Deluxe) had a convex profile while the Stage 1 and on are concave (until the 2007 model, of course)
I've never heard of a Stage 2 or Stage 3. The Stage 1 was a stop-gap cheap engineering way to get a torquey motor into the Series III ahead of the more extensive 110/County/Defender design being finalised.
The motors as originally fitted were detuned to 68HP. Of course, no-one has them in that state any more

LR thought people would kill themselves if they could travel 120km/hr. There's a placard under the bonnet telling you to buy better tyres if you intend to travel 110km/hr
They will travel highway speeds comfortably and tow the rated 3.8 tonne. You can engage low range on the road and even with the highway gearing they have mountains of torque compared to a standard Series III.
Check the markets, Shorty and PM me - I'm doing crazy deals today since it DIDN'T pass its roadworthy (needs $600 of repairs).
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