so i just picked up my first Z and i LOVE it. it's a 1972 240z. the owner before me swapped a l28 with a n47 head on it. my goal with the engine is to get it to about 220-250 hp. so my question is if the n47 head is good for what i want to do or should i try and get maybe a p90 from the pick and pull? any response would be awesome. thanks