Got used Tilly, model HL 314e with hortsman intake for flathead. It ran very rich, so I took it apart. The gaskets were old and hard figured that was the cause. I was told many of the HL 314e were set up for alky. Now I'm thinking this was cause of running rich. I have the Welch plug off, with 4 holes two small two large, was told you can tell from holes but how? Also there's no needle valve to regulate gas , just a brass plug i removed with a 5/16 socket. It has a clear glass ball and a another ball under it. This doesn't seem to be shown in any rebuild schematic s I've seen.