Yeah, you're gonna need at least a 1/4 mile of smooth unobstructed road and preferably with no ditches, fences, other obstacles on the sides of the road. Speed runs tend to get expensive as crashes are likely to happen as you're dialing the car in so if you can find soemthing like I'm describing it...
I dont understand why you are doing 600ft runs. If you're going for top speed then why not run it a real quater or half mile. It used to take at least half a mile for my Rustler to hit 110-120MPH. Thats pretty damn fast if you ask me