I have a Majestic Circulator Fireplace, Model MC3200 (circa 1985-87) installed, wood-burning. We want to convert this a gas log set (propane). Can we just add the gas log set (and associated gas lines, etc.) without having to alter the fire box, or do we have to do something special to the existing firebox to burn propane? The box has circulating vents on the sides of the firebox which we plan to keep in operation with a propane fire. Thanks