I checked the 2.0 engine that I have apart and the head casting number matches yours. My block has the casting number 70HM6015BA like yours but instead of 24G70 it has 10J70. Unless Ford reuses these numbers, I suspect you have the 2.0 litre engine. This engine was available in the 71 to 74 Pinto's and early 70's Capri (in the USA).