This reply is a few years lagging, but that engine is NOT a 'Super Rat' as it definitely does not have the Super Rat internal CDI ignition setup. The Super Rat has a distinctive 3 bolt holes on the ignition cover due to it's larger than normal pickup sensor, yours here has 4 holes telling us this has the normal basic ignition setup. The Super Rat ignition WILL NOT fit under a 4 hole cover period. Sorry to be the barer of bad news.