Wow thanks for a all the guick responses. I don't know if I can comment separately to each post so this is combined.
Brake buster; I presume to have bought a DD6 engine from a 94 XJ81, I understood they were all fitted with Marelli. I have not physically checked. Also SovverBovver, can you supply a clean XJ81 body....?
My original idea was to buy a cheapie V12 and drive it overland home (Malawi), but they were out of my budget when I discovered import duties were nearly 200% of the total cost of buying and getting it here. Secondhand engines are duty free!
Naki_k; I have everything I hope to make it run, including all complete fuel system with pipes, pump and tank, full exhaust system, radiator, electric fans, air boxes, ecu, Jgate transmission computer, 3 wiring looms, basically everything the previous owner took off the donor car to make it run in a home build, including a video of it running in the donor car. I need a high ground clearance and cannot make a chassis so I'm thinking of an old (with or without) 4x4. I just missed a local Range Rover, most of the running gear has gone to Landrovers. Failing that a 2 or 3 ton lorry.
pimgmx; Your marelli info is similar to mine. Jaguar Heritage website says it will only confirm not provide numbers, without a vin or v5 I'm a bit stuck. I will ask the guy I bought it from, he may have some records.
Thanks again for all your replies, I have planned this as a 5 year retirement project, maybe I'll end up with an old mans car!