If they were in production I definitely would have suggested two FP .15's. Great little engine. I have one very well used and loved, and one recently snagged mint NIB.
BTW - I have a buddy who for some time has wanted to find a pair of .09's or .10's for a Catalina twin.. .15's too big he says. So.. are you keeping or ditching them? If letting them go I can contact him.