If you would like to line an antique stove with refractory I would suggest a castable refractory cement http://www.northlineexpress.com/itemdesc.asp?ic=5RU-600
I did this on an old potbelly stove and it worked very well. If you have a ceramic supply house nearby they should also carry it.
You will need a sheet of thin galvanized sheet metal for a form. Cut a round piece with a hole in the center to cover the grate and space it up with some flat washers so the grate will have freedom to shake. Next form a cone from the sheet metal that will be about an inch smaller than the firebox and fasten it to shape with sheet metal screws from the inside out. Grind or cut off the protruding ends. Place it on the flat round piece sitting on the grate. Now pour the cement, being sure to pour evenly so the form stays centered, let it set for a day and remove the form. The bottom piece will have to be snipped to get it out or cut it in two pieces first before pouring.
You can make a pattern for the cone from heavy paper. Form it and cut the bottom square and that's your pattern for cutting the sheet metal.
Also very handy to make your own brick to fit odd shapes.