sohc zc

i have just bought a 90 crx dx it has a zc motor that has a locked up cam on the two center back rocker mains lack of oil is what i think. the motor has zc stamped in the block, it is sohc non-vtec, it looks like it has the 1.6 cover on it and it has a 107 tooth timming belt but i don't know, and the thing that has got me the most confussed is that it is not mpfi but dp-fi. dose this sound right to any body? any help on this would be great thanks. and if the motor would be worth saving i think only the head is heart. is this motor factory to this car because the vin decode on this site said that the car was asembled in japan.