i aquired a 1971 240z from my father in law. Ive been doing some research on the net about it. here is my question, trying to find out what motor is in it. Looked on tag in engine comp and it says L24 (12913) body HLS30 09935. The block has a designator N42, head N42. When I look up N42 block it says its a L28 from a 75 or newer z. Help pls.