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Well Tommy, I just looked at mine again. For what it's worth, I believe that if you cut open the intake area on the front of the cowl where it is supposed to be, and the cylinder head is sitting directly in front of it, you will probably get enough cooling if you open up the back of the cowling enough. Some years back, I read a really good article about engine cooling. Don't remember everything, but I do remember the article saying that the only part of the engine you needed to worry about was about the top 1/3rd of the cylinder head, because that (obviously) is where most of the heat of combustion is generated. There was also some stuff about the opening to let the hot air out had to be at least twice the size of the inlet. I guess the reasoning there was that the cool air would be coming in, picking up heat and expanding, and need more room to exit. I guess you could give it a try on the ground. If it works on the ground it certainly should work in the air.
I have just never been a fan of inverted engines. Tried a couple, didn't like the trouble they caused, and at my age I'm not looking to add trouble. I considered inverting mine for a little, and putting on glow drivers and the works, then abandoned the idea for simplicity. If I don't want to see the engines, I just look at the left side of the plane!!
Maybe Bill Robison can give you some insight to this. He seems to be on top of stuff like that. I've sure used a lot of his advice.
Good luck,
Randy

>>EDIT for HTML coding. wr.