I haven't done a ton of research on it, but I see some people starting to use the newer Camaro power steering pumps as they are high volume from the factory. Might be worth looking into.
I have a PSC TC pump on the shelf for the buggy. I'll see how it goes. I used to run stock TC pumps on my old jeep and they did fine.I'm not sure. I've been looking at Trail-gears pump for an early toyota with a v-belt, but it's pretty pricey at $300.
I'm open to other ideas though.