Ive got a 91 Trans Am, and have had quite a few Thirdgen firebird/trans ams over the years. as long as you have that air dam under the car, it'll stay cool.
the only time ive had cooling problems on any of them, the air dam was missing, once replaced it stayed cool.
U can easily hook u a fan switch to run them when u want, and keep the factory settings so it kicks on automatically at whatever super high temp the factory set (incase you forget to flip the switch),
newer cars got dual fans. Ive run them pretty hard, and as long as that air dam is in place and you have a fan switch for when u have to sit with the car running. they wont have any cooling issues.
use the openings in ur grill to run some ducting to an intake for ur motor, or your front brakes, if you plan to track it someday.