This chap is building a 400 series T5 AWD by transplanting guts from a 850.
https://www.youtube.com/watch?v=xB3NFJur9vs
....but it's not really something that could be described as an "engine swap" !
The 400 series had Renault engine/transmission. A few people in the day dropped in the 2 litre engine from the Renault 21 Turbo.