RE: Senior Kadet
Congratulation you have just choosen one of the best and most successful trainers in the history of RC. Suggest you mount the engine as intended. Inverting will not give you a better anything aerodynamically. There are a host of potential problems you can run into inverting and one of the biggest is dificulties in using an ignitor conviently on the plug and a remote connector presents even more convience problems such as what happens when you want to change, check or clear a plug.
Its the best trainer ever let it do its job and don't get caught up in the common obsession with cowlings that have no holes. The engine must be allowed to do its job it must be allowed to breath and High speed needle valves, low speed needle valves as well as the glow plug needs to be completly accessable from the outside.
John