Have you tried breakers yards?
Being a '92 Talbot is it a 1.9 petrol - these were used by Peugeot in the 504 and other car models of the era.
It you type 'car and van breakers parts' into Google quite a few choices appear although whether or not a half decent engine can be found is another matter!
Have you looked at the feasibility of a rebuild, if appropriate?
You would need to consult an expert, if you can find one, so it may well be a long shot but a 2.0l petrol, either engine or complete engine & transmission, from a Boxer might, or might not, fit? It's a much better engine, quieter, pulls better, easier to get parts for, but possible changes to the chassis and mountings may have accompanied the change of model around that time.