Gayle, your local guy is an idiot. An out of balance tire will bounce your eyeballs out at highway speed. He must think old cars are only for parades.
There are several ways to balance a wide five. The simplest and best way these days is an adapter from Speedway Motors. Of several available, this one is cheapest and has the studs you need. Importantly, the adapter must be balanced alone prior to balancing your wheel.
https://www.speedwaymotors.com/Wide-...ern,29220.html