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It is a simple task to do this engine swap. You may have to make a cable or have one made, but as far as mounting and hookup, it will be an easy swap. they changed the engines when Tecumseh went out of business, that is why they also have the briggs engine that will work with it. They can send you the proper cable for it as well
I found that your current shaft is a 1" shaft. Most likely you are going to need an adaptor, as most engines this size have a 3/4" shaft and apparently are a little shorter than the current Tecumseh shaft. They do make adaptors for this reason though. Make sure to ask the REP there, what size shaft is the new engine come with and if anything is needed.
I am unsure of the current engine shaft length. It is best to measure it once engine if off of machine. From my info, it is a little longer than the B&S shaft
From my knowledge and experience, you will have to modify and adapt.
It WILL NOT fit without modifications and adapters. The shaft on the B&S engine is shorter and not as wide either. The Tecumseh shaft size is 2 3/8" long protruding from inside engine outwards.
The Diameter of the Tecumseh is also 1/4" bigger. I hope all this info is what you are looking for. If you would like to know any thing else, please let me know
Hope everything works for you. It is rare that that size engine carries a 1" shaft. I hope all works out on this project and you can complete the engine swap to keep this machine is service. If shaft size is the same, the only thing to worry about its the shaft length, but you can install an adapter if needed