You need to give more information to get a real cam recommendation. What bore, stroke, rod, compression ratio, head flow numbers, etc.......
What kind of car? Frontal area?
You can just look in any cam makers catalog and find a cam that will run to 8000 no problem and get 90% of the horsepower the motor is capable of making.
Its that last 10% or 5% that you really have to work for.