it shud be mate, cylnder lines should be smooth & shiney, if there scratched in anyway it has picked up. scores will be straigh up & down. look for deformation on the head, (put it on a flat surface & look for gaps underneath). try turning it over by hand when the head is off & check all 4 bores.

if you can take an engine out you shud be capable of rebulding 1, the damage on this engine should be fairly obvius.
the hardest part mo is puttng the engnes back in propely & tidy.