It's an older briggs, the 4 post coil was used in the early 60s they switched to the two post coil around 1967 or so. There should be numbers stamped into the cover behind the air cleaner. If you measure the bore and stroke then we will be able to tell you what engine you have. It is at least a 2 hp up to a 3hp. Check out my video in the briggs engine section of a mildly modified 3 hp briggs