I am going to run the earlier 125cc engine now, as i believe it is period correct (as it is not exactly the right engine) but should be the same type.
The 70 series engine in the first pic is gone, replaced with the one in the second engine pic.
It too is a bit late in the run 1.1 million serial no (prob about 68-69) they should have been about 750 thousand in 64.
Anyhow, that's whats going in unless someone gives me one with the correct serial no

.
will let you know how the resto goes
Paul