Electric Power Steering Pump - 1967 Barracuda

Excellent job on the research. Have you thought about switching to a manual box and running the inline motor EPAS units, like whats found in the prius? I think the steering box style is the problem with flow, the hydraulic steering racks probably take way less flow.
That's not a half bad idea, but I don't think there is enough room to easily fit it all in there. I agree, the racks take a less flow (and use more pressure typically) from some basic research. The hydraulic assist circuit area is also much smaller on the all the racks I've seen so it would take more pressure less flow for the same amount of power.