V5 doc alone will no longer normally be accepted as proof of engine age. This is because of the large number of people during the SVA years who tried to get round emissions test by registering the donor with a different engine then building their kit.
With SVA, emissions was based on age of donor vehicle and assumed the engine was the original type for that vehicle. Too many people got caught building kits where it was blatantly not the original type of engine from the donor.
As TT says, where you can prove the donor engine is the original from the donor car then V5 doc may be accepted.
It should not, however, be a problem to get written conformation from the manufacturer of the engine as to it's age and this will be accepted as proof.
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