As long as everything lines up, you can run the clutch and sprocket on the right. Just make sure the clutch you get can work for a CW setup. These engines were used on both sides of karts and a lot of clutches for these engines are CW or CCW only, double check before ordering. Also note there are inboard and outboard clutches too. It appears that your engine has an extended crankshaft nut, they are used in karting without the pull start. The previous owner just shimmed the recoil out and that is why the housings don’t quite line up. Also the scrub brake probably won’t be sufficient once you get that WB up and going but I wouldn’t ruin that Rascal frame over installing an engine,