I'd put that 56a in a Swany Fat Free Taco. I'd also look at the NitroPlanes Yak25. You could also get a Mojo 40 and build it light for foamy-style floating and power.

For the 86a...I'd look at the small line of Aeroworks planes. Maybe a Mojo 60 or an OMP profile plane. If you want more of an IMAC style plane, the Seagull 60-size planes are good, too.

I'm not sure what the stats are on either of those engines, but from what I understand that's where the range in which they need to be. Give us some more info and we'll probably be able to help more.