Hmm year of manufacture? 1978?
Be nice if it's the donor car age but may not be? Poss pre SVA you may get away with it though
Certainly for SVA/ IVA cars year of manufacture is the Chassis AFAIK.

Everyone will be searching out kit cars that are not registered correctly and still called their original donor just to get tax free......great for those that have gone to the trouble of doing SVA/IVA ....NOT!