What is the best economical brake set up for a 300zx na that is endurance road raced?

are you plannign an enduro or just trackign the car? if yu plan to run an enduro you'll definitely want to run brake cooling ducts and might considder an aftermarket rotor and calliper configuration if allowed by class, coupounds might also be regulated by class but aftermarket willwoods will offer a lot more pad compound options, pegasusracing or similar will have all the various compounds avaialbe in either case and will be able to help you select the one that fits your needs best

i have power slot brakes and bridge steel brake lines and hawk brake pads witch are ceramic and they stop on a dime and it is an inexpensive upgrade.

hawk makes many differetn compounds, only a few that I am aware fo fit the stock calipers, they do make multiple road race compounds available for most wilwood callieprs