Electric Power Steering conversion kit question

This one has been a back burner idea for me for a while. I'm somewhat forced to manual steering due to my 3G Hemi swap (though I guess there are power boxes out there now that are compatible). I don't really want to add a whole hydraulic system though if I can get around it, so the thought of an electric one is tempting one of these days. I would likely go the $100 junkyard route with something like the Prius box (or one of many others out there). I might even be able to pipe a speed input into it and not just run it in failsafe mode like most do as I have a computer setup that I could custom broadcast CAN messages on, assuming I can find out what the control unit wants to see and talk to it. Just not sure how much room I have to work with on my 67 Dart as I'd likely have to keep it on the inside of the firewall. I think it might fit really well bolted directly to the firewall where the big flange on the stock column is now, but without a unit in hand to see what the motor might hit I don't know. Tempting either way, but low priority for me at the moment.