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Going that fast on a new engine doesn't sound like a good thing to me. They need to be broke in and have the rings seated before pushing them that hard.
I would check with your engine builder and get their recommendations on driving speed and duration of the break-in.
That being said, a stock Model A is said to have a TOP speed of 60mph. You might get a little more RPM with the counterbalanced crank, but without a grearing change or an overdrive, your not going to get much more speed. It is not a good idea to run the car at top speed for very long. Mine is all stock and it likes to run @ 45mph.
Also make sure you have the brakes to stop if you plan on going this fast!!!