These are the 2 I had sitting in the garage gathering dust they work fine they used to sit on my 2 main Rover edgers untill I found a couple of 80202 3hp engines and did the swap. I would love to put one of the 80202 on the SB45 but they're 3/4" shafts plus now I learnt that the tanks won't fit either, the 2hp Briggs probably just need a service and a paint i know I changed all the gaskets a few years back. I think I will use the 78' model as it's got the choke on the lever where as the 81' model is a manual pull choke. I'm still sentimental about the original Kirby engine, I would still love to get it working even if it's put aside and retired, those score marks look worse than they feel. Still might throw some new rings in it cause I can even if it burns a little oil but still run the Briggs on the SB45.
