Corvair Engine on a Mini/Strong Enough/Powerful Enough ?

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I searched but didn't come across to much information regarding the Corvair motors on this site.

I ran into a friend of mine and he said he has a running good condition Corvair motor he pulled out of his car and thinking of selling it.

Not sure what they run as far as cost etc but wondering if this would be a good motor for a Max Mini (see What is a Mini Airboat Section of the forum) 12'/13'6"x7'6" mini.

I'm trying to research the engine now-HP/Torque etc. and see if I can get away with not using a reduction setup, but if I have to, then I'll need to look for that as well.
What rotation would a Corvair motor spin the prop?
I know ArrowProp has one for a VW/Subaru but not sure for a Corvair.
Guess I can fab one up if he is willing to sell it at the right price etc.
I still have my Rotax option open for now, but looking looking into other viable options/cheaper to fix and maybe run.

Thanks again,
Jim