Yes, you have a 4.0 GEMS engine (SAGEM ENGINE MANAGEMENT SYSTEM)
RPi engineering has been pretty successful with there chips (you have to do 2 chips, one is for fuel injector control, the other is for timing control) but you need to give them YOUR ECU, not one your body gave you, or one that came from the junkyard. It has to be done by them, they remove all the factory lockout BS and add their own scramble package. It costs pretty close to 700GBP ($1400 US) and they claims of 10-15% BHP increase, midrange torque increases, and fuel efficiency improvements, have been substantiated.
FWIW, if you go to a 4.6 engine from a P38 RR, pre 1999 1/2, it will also be Gems. If you go for an S2 Disco, or 4.6 from a post 1999 1/2 RR, it will be Bosch engine management. There are sensor differences, but thats about all. Don't even think of changing a Gems Car to Bosch (or vise versa, not that anyone would want to) as it would basically come down to rewiring just about the whole car. On a '97 with possibly 100k miles by now, it's a tossup which is the better route; changing the engine out to low miles 4.6, and the necessary ECU change for thecapacity increase, or rechipping your 4.0. Simply rechipping the 4.0, without some rebuilding to the valve train (cam, chain, lifters, regrinding & lapping the valves) will be a wasted effort. Doing both, and you won't care you don't have a 4.6.
The biggest improvement anyone can make to a Rover engine, is the least cost, but very labor intensive job of port matching your intake and exhaust.
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