I'm new to this hobby. I have a Piper Cub that is about 85% done. My plan is to mount the engine upside down. I have a K&B .45 engine that is about 7 yrs. old and I just got done breaking it in since it was never used. Basically, it's new. I went to the hobby shop to get the engine tuned because because I couldn't do it myself. I found out the glow plut was crapped up and I had the low speed disc setting too rich. My hobby shop guy told me to get a special glow plug (one with a bar near the coil) if I was going to mount it upside down.

Q1: Will I have problems mounting this engine upside down. My reason for this is because the head doesn't stick out of the cowl when it's upside down. The WHOLE engine is in the cowl.

Q2: Will I have heating problems because the engine head is not sticking out of the cowl. My plan is to cut out some holes in the front of the cowl to let some air in to cool the engine as well as to vent the carb. Also, I plan to cut out a hole at the bottom part of the cowl to have an outlet for the hot air. Basically, air goes in through the front holes, and out the bottom hole.

Q3: I just broke the engine in today according to the manual. It said to let it run on a rich setting for about one hour. I did that. It took about 5 refills to my 10 oz. fuel tank. This is different from what the hobby shop guy told me.
My hobby shop guy told me to run it rich to where I can touch the head, then run it lean till it heats up and you can't touch it anymore, then run it rich again till it cools. Keep doing this for 5-6 refills.
I tried the way the hobby shop guy told me, but I didn't know it was too hot to touch. Heck, even at the richest setting it was too hot to touch for more than 2 seconds. I got frustrated and just broke it in the way the manual says because it was more objective.

Well, thanks in advance and I'll post more questions in another post as not to crowd this one. I hope I used terms that you experts can understand.