Do you have the capability to print your own decals? Reason I ask is that I have 5 Zip files of detailed photos of Engine 51 that I could send you. There are some files in there that are set for decals.
I don't think the torsion bar would be a good choice with a low-boy. The torsion bar is a lightweight suspension, so you're better off with a heavy duty spring suspension or a 6-rod. So you know, the spring suspension in the KW kits is a 38000# suspension, and would probably be too light as well.