Truly, masses of Moors were sent back to Africa. And, from 1200 to 1500 lots of mixing and convertions happened in South Spain. So, berber blood is here too. And the influence of arab vocabulary in Spanish can be resumed saying that 6000 common Spanish words are arabs. Gil are known for being used for conversors.
Greek ancestry is very unlikely.
Besides they collaborated massively with Romans, so their cities grew a lot and in fact, occupied some land of native iberians during Pax Romana. Well, the interesting mix of Celts and Iberian. Living in the center of Spain. Well, Numantia and some other heroic wars probably left celtiberian population to a testimonial role in Spanish gene. I think it's basically unmeasurable.