2.1 td donor parts required

[illzlee]

I'm gonna pull the engine and box out of my bay this summer as i've got an AAP to fit, seems like the right time to go the whole hog and put the 2.1 in.
Donor cars are a bit thin on the ground, without a massive mileage, but we have a PSA specialst breaker in derby so i'm wondering other than the 'engine' per se - what do i need? is there much of an ecu similar to the 1.9?
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'79 Bay running citroen 1.9td and phat tyres!