Fordfarmer is correct about what engines should fit. But to convert to a gas engine, you also need to change a bunch of other parts, like linkages, fuel lines, fuel tank, etc. It might be easier to just rebuild what you have, assuming it is just worn out and not broken.
Another thing to consider is buying another diesel engine. A couple of years ago, I bought a used 172D that a regular poster on the Ford Board had and wanted to sell. I paid about what a rebuildable core would be worth for a complete engine with injector pump and everything else. It is stored in my garage waiting for the time my very worn 144Diesel engine quits working. The replacement engine may or may not need to be rebuilt, but I have so little in it, it wouldn't be too bad if I end up rebuilding it. As Fordfarmer mentioned, 144Diesel engines are hard to get parts for. 172Diesel parts are more expensive than similar gas parts, but are available.
I also have a 651 Ford with a gas engine. It takes lots more fuel to get a given job done than my 641Diesel tractor. Even with diesel costing more per gallon than gasoline, I believe the diesel tractor is a lot less costly to use for various jobs.
Good luck! If you do decide to convert to a gas engine, you might consider trying to sell all or parts of the diesel engine you have. I bet there would be buyers out there.
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