I'm inclined to agree with Dobie, but a little different reason. I went and looked at the mid 50's site. Most of the power kits are conversions to modern boxes (rebuilt Toyota), and the ram system I found (wrong price, might be wrong one) is kind of a cobble. It says it was only a "big" truck" option at the time. Ram systems tend to be leak prone and vague on center compared to modern systems. I drove a lot of them, and I'm still working on a couple of them. Might just be they get a lot of complaints from people who expect a modern feel. Could be a bump steer problem. Who knows? If you're set on one, I'd ask them why the don't recommend it, and consider the alternatives they offer if they give good reasons.