It's going to be a tight fit for the engine, you might have to use an offset intake for the carb. Also, that back wheel looks like it might be a 27.5" with 32 spokes. If you are using a rag joint setup for the rear sprocket you will have difficulty installing it on a 32 spoke wheel. I would recommend that you find a 26" rim with 36 spokes or else get yourself a sprocket adapter that will fit the diameter of the rear hub and work with a 32 spoke rim. Also, you will need to use a universal front mount to fit around that down tube. I would find something else.