BTW, just a suggestion.............

There is at least one motor mount on the market that is two-way adjustable. I've got a couple of airplanes with one type on them. It can be adjusted for narrower or wider engines without removing it from the firewall or redrilling. Loosen the 4 mount-to-firewall bolts and fit the engine between the beams. Tighten it up to the firewall and plug the engine in.

It's interesting and informative to fly one airplane with different engines. You also learn how the different brands of engines compare. And you also wind up with a decent "mule", an airplane that'll serve to break in new engines that're destined for your "high value" airplanes that you'd like to maiden with the security of a tested and proven engine.

I've got a mule for breaking in engines, and you can't imagine how much calmer it is to maiden a brand new airplane when you don't have to worry about how the new engine is going to do.