I had this exact range !
I had a range like this one in an apt. built back in 1979! roasted my first turkey and sucking pig in one of these! really efficient being 24" wide, I tried Nordic Ware's spring wound convection fan using a third rack in the top of the oven, when I baked multiple layer cakes. It helped bake more evenly but eventually the spring would not last more than 15 minutes no matter how much winding.