Let me ask you this, then, this is for a kyosho Spitfire ARF. ( or BARF, Minnflyer

)
The thrust line is toward the upper right corner of the firewall, if facing the firewall straight on. How can I center and lower the engine better, so that I can mount it sideways? How would I calculate the amount of sidethrust I need to build in to the engine mount to make it work? In fact, is that even the right question to be asking? After reading the responses, I'd rather not mount it inverted, even though the directions have it that way.
Thanks.