I'm looking for a replacement engine for my Midget. I would like to keep the stock engine but would be willing to do a simple conversion. Does anyone know where to find an engine or have any ideas about a conversion?

I'm looking for a replacement engine for my Midget. I would like to keep the stock engine but would be willing to do a simple conversion. Does anyone know where to find an engine or have any ideas about a conversion?
There is several on Ebay for the 74 MIdget, 1245cc I believe it is what you have. I have a 75, 1500cc bought one on Ebay for $500 shipped with less that 10k on it. Good luck