The old 240 was the fastest Z untill the 280zxt, but not because the motor necessarilly... It was frickin weight and emisions. So, I have a 1981 280zx, and I can't get the P90 head, but I have the f54 block (p79 head) but if I get rid of emisions, I should pull some real good horses... I have a header, flowmasters, K&n Cold air, no Ac, gettin rid of heater, all interior, and everything else I could do to dump weight. How do I get rid of emisions, what can I spare, and what can I do for some more affordable horsepower?