I would definitely look into those headlights from 180. Those are nice and they do great work! just expect some down time for the Z. You won't be able to drive without headlights. Unless you are going to buy a pair and send those over there.
As for the emblems I usually get them from EVO-R. Everyone says buying from them is a crap shoot, but I've never missed a shipment and they are there at my place within 5-7 days max.
EVO-R INC. Nissan 370Z Z34 Z Emblem Front and Rear
They aren't the Nissan Hamburger emblem, but there is the nice Black on Black Z emblems or the no back black Z emblem.
The 40th color code is KAV. It is very hard to match Pearl White, Monterey Blue, and the 40th color because they are all 3 step paints. You have to have a shop that really knows what they are doing with paint matching.