Scott, I have one about that size and had my electrician neighbor wire up a plug at the meter/main breaker. Now I can flip the breaker from the power grid and then plug the generator into the house. If I turn off all the 220 breakers then it will run everything else within reason. Nice being able to still flip on a light switch instead of using flashlights.
I'm going to make one up like that. (I'm assuming you mean a male end to plug in to the generator, and a male box on the breaker panel?) I currently have two 110s that I use. I just take the panel off the outside box and wire one leg into each side of a 220 breaker that I have in there just for that. I've had my dad's old (like 30-years-old) Craftsman generator over here for years, but I have to tinker with it every time I use it. I hate Tecumseh engines!