Registering an engine swap

[jim]

I know this isn't a new question but where would I stand in this situation:

I'm interested in buying a car that is registered as a 1.9 gti but it has had an engine swap from a 406 turbo - similar engine but different at the same time.

It is still under its original engine on the V5 - I can't vouch for the swap etc so where would this leave me when applying for the documents and insurance?

[VIP]

If the engine size is the same, I literally wouldn't bother with the can of worms.

[dodgerover]

If the engine size is the same just send in the logbook with the new engine number

[Kieran]

The may want proof (receipt, log book, etc) of the engine source.

[1900sr]

How about getting the current owner to give you a receipt for the engine separately to the car, then you'd have a receipt for the engine.