I used this batter to bake eight individual loafs. I personally feel it is better to bake in a flat tray to keep the cake thin, so that it soaks the liquid better. The batter would go well in a 9 inch round pan or square pan.
Use condensed milk as per your sweetness. The cake isn't sweet. I used the whole tin and the milk was too sweet, but it complimented the less sweet cake, so didn't make much of a difference.
If you can't get hold of evaporated milk, substitute with more milk. You can add a little cream too for some added flavor.
For the whipped cream topping, instead of the powder, you can substitute with one cup of whipping cream, 1/4 to 1/2 cup icing sugar as per taste and a splash of vanilla, whipped till stiff peaks.