[rotorwrench]

If the rim will hold air, you can go tubeless. It helps if the rim sealing surface has the ridge around where the bead seating area making them safety type rims but it depends on whether a new style rim was used to widen them. Safety rims started to be used by Chrysler in the 50s. The later steelies had rivets and sometimes they leak but I don't know how your modified wide 5 types are put together.