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What do you really need?
A stock A from the factory will run 60 MPH all day long (or more).
Of course they were well balanced and machined properly.
Simply adding the HC head just takes advantage of modern fuels. Using a B type cam or better yet a new Stipe cam that is a modern science improvement over the B cam does wonders. BUT you must use the correct diameter lifter heads. Using the the wrong size might ruin the cam and throw off the valve timing. I suggest that you use what Stipe recommends if you go that route.
Counter balancing the crank is useless if they crank is not properly ground. A lot of cranks are not properly ground. So get it done by someone that will get all the center lines correct and put the correct radius fillet in the corners.
Larger valves are not really needed unless you plan on a monster motor. If your goal is running highway speeds and having fun then keep it simple. An overdrive is likely to be a waste of money unless you intend on driving zillions of miles on the highway.
Keep in mind if the bearing got 50,000 to 80,000 miles running 50+ MPH constantly when the A was new. That was without overdrive. So with our without counter weights that is what you should expect without an overdrive.
But as I always say, what could I know. I am only applying logic and how the cars were run in when they were new. Seems some think the car has changed a lot since it was just a used car.