It depends on what you want to accomplish. If you have an 124 CI VAC engine, and all you are looking for is a show/parade tractor, that may be an inexpensive path. Others have indicated it will bolt right up, but I have never been that lucky. There always seems to be a gotcha of some sort that elevates the cost to something close to what it would have cost to fix what I had to begin with. It also creates a problem if you ever want to sell. Mis-match tractor/engine combinations usually don't sell as well as one which is matched up correctly.
If you want to maintain the utility and hp of the 300.... The 148 ci engine with thrust washers and 2 bolt starter was/is a very common engine. If in your shoes, I would look for a good running engine, or a donor block and rebuild what you have. - Joe
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