Pitman, I don't quite know what you mean by "greasing the front wheels" with an Alimite gun. The kingpins, have Alimite fittings and you can use a modern chassis grease.
I use modern multipurpose 85 wt-140wt gear grease for where the lub chart for my 28 says use 160wt oil .
Some "Antique car" vendors sell 160wt. oil for around $7.00 a Qt. I have bought a Qt. and it appears to be nothing more that 120wt multipurpose gear grease.
I would think to grease the front wheels would require that you clean and repack the wheel bearings with wheel bearing grease.
I have found that Alimite fittings are more for show that practial for greaseing, I pull them out and replace them with Zerk fittings, save the Alimite fittings, You can clean them up and when showing the car use them to replace the modern Zerks,....... just for show.