That's going to be a tough one to fill. Most 80"+ planes are going to be up in the 1.20 size engines. Not sure what you are looking to do with it, but you might consider a Sig Kadet Senior. It is 80" and has the landing gear on the fuselage, and it's going to fly well on a .90 size engine.
I've used the .91 OS 4-Stroke as a replacement for .60 sized airplanes quite a bit. In fact, it's about the perfect engine in a Sig Hog Bipe. That's why your request is going to be such a rough one to fill. Most bigger planes like you are looking for are going to need bigger engines.
Hope this helps some.