Summit Electric Cutout Kits Beware!

I think you'll need to index or add new "holes" to the cutout flange to rotate the assembly.
I believe what Clint is saying is the flapper stop will be on the wrong side (or outside) of the exhaust pressure when closed if flipped right to left. He would be relying on the motor to hold a closed position.

But what Bill and I are recommending would fix that. Just take the motor off, remove the flapper and turn the whole thing around.