One of the best things to do while the engine is out is to give the whole unit (including the engine) a deep clean. With the engine out you can clean the inside of the frame. I would recommend going ahead and taking the fender pan off if you have not already and cleaning the transaxle area etc.
Also like Rydplrs mentioned clean the engine, take all the tin work off and give it a good cleaning. While you at it replace the hose from the engine crank case to the fuel pump.
Also like Rydplrs mentioned clean the engine, take all the tin work off and give it a good cleaning. While you at it replace the hose from the engine crank case to the fuel pump.