Hey guys ,
chris your engine is indeed an 80 series engine as itt has the side starter and the coil isnt under the flywheel, they were a tough mower and have survived well those 80 series motors never seemed to wear much.
mark the power plus heads are quiet common victa mowers with a power plus sticker has one some of the super 24's had them , utility's but make sure you have the muffler or you will find the standard muffler will restrict any extra power the head gives you.