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What is your mission? (And budget)All of these engines are going to work well. In a stol you will be able to go 90 or 100 mph.
You will be at pattern altitude by the end of a 5000 ft runway. Do you plan to operate at high density altitudes?
Then you may want a little extra power.
Personally i have a corvair 3.0 with 15 hrs into phase one.
No you cannot climb at 50 mph for five minutes but the climb performance is simular at 60. Some other engines are not rated for max continuous power. The sound of the corvair cannot be beat. I also know if it ever needs work that is something i can do and for minimal expense.
Also you will want to research what kind of firewall forward kits are available. Some engines need a header tank and multiple fuel pumps. I prefer my gravity fed carby.