440 under car headers need advice.

What if your car was manual steering to begin with?

A big block a body with manual steering is no big deal. If you switch to as rack it's even easier to steer. My wife drives mine.
If I bought an A body with no power steering, I would add it. Without a doubt the best solution is one of the aftermarket front ends with a power rack and pinion.
If I bought an A body without power steering, I would go through the trouble to add it. Without a doubt the best way is to go with one of the aftermarket front ends with a power rack and pinion but either way whether stock box and pump or rack and pump, PS makes the car a lot easier, enjoyable and safe to drive. Even on a bracket car I use it. The only way I would go without it is if it were an original numbers matching car where adding it would hurt the value or its a total balls out heads up car or class racer where every last bit of e.t. counts for winning. I guess I'm a candy *** but I hate driving without it, I'd rather give up the small fraction of performance than to go without it.