I have an antique (1940's) gas stove in my basement that I'd like to have converted to propane for emergencies. Who would I call to have this done? I'd like to get it done properly so I dont have to worry about how safe it might be.

I assume that you are talking about a house heating type stove, as opposed to a camping type, and you don't state what brand it is, or what its current fuel is. In that case, I don't have a clue. Maybe check with your local house heating stove dealer...

Sorry...this is a cooking stove. 4 burners and a small oven. Natural gas.

You'd have to swap out the orifice plate and add a prv at a minimum.

The sell Nat. Gas to propane conversion kits.