With the Toyota engine, you have to look for a code.
It will consist of a letter/s eg. A, E, K, T, ZZ, and a number. This usually refers to a revision and what years the engine was in production for.
So you could be looking at a E1 engine, or a T2 engine. Take a look around it and see if you can find anything.
Also:
http://en.wikipedia.org/wiki/List_of_Toyota_engines if my explanation was a bit bland.
As for the tail-lights, I haven't got a clue, I searched for ages using Google and looking for lots of Datsun models, but chances are they could be from an old Toyota.
_________________
910 S3 Bluebird - FJ20ET, E85, IRS, 5 Speed, 4.4 LSD
910 S3 TRX - RB25DET, Coilovers, S13 Front end, Power Steering
RA23 Celica - 18RG, Twin 40mm Webers, Coilovers, rolling on SSR mesh 15x7 0s.
1600s arent the only datsun