The Israel Shermans is an interesting story. I would at least start with the follow:
https://tanks-encyclopedia.com/coldwar/israel/m50-51_super-sherman.php https://www.tanks-encyclopedia.com/coldwar/Israel/ISherman.phpIf you can, I also recommend picking up the book "IDF Shermans M-50 and M-51" by Tom Gannon. This book will be very useful for your project. More information about the book in the link below:
https://www.scalemates.com/books/idf-shermans-m-50-and-m-51-model-foto-focus-tom-gannon--125787It would be nice once you start on your M50/M51 Super Sherman kit-bash project to share with others the progress of your model, and of course the finished result. Actually, this seems like a fun project and look the hear from you how it turns out.
Edit:Sorry, I just realized that I misunderstood the title. I was thinking of the more famous M50 and M51 (mostly because I just watched The Chieftain videos on it), and thought that maybe you might have meant M51 and not M1, but there is an Israeli M1 Super Sherman, which is a different tank. In the 1950s, Israel purchased some Sherman tanks. These were armed with the 76.2mm M1 gun, so they were designated M1 Super Sherman to distinguish them from earlier variants equipped with 75mm guns. Many of these featured rounded cast hulls, air-cooled radial gasoline engines, and Vertical Volute Spring Suspension (VVSS). These tanks first saw action in the Suez Crisis in 1956.
In this case, I would just use the model as is without any kit-bashing. In fact, it seems like no or very little kit-bashing is needed. For those subtle differences, very few if any will ever notice them. Also, depending on how you paint your model, you can still use the model as a WW2 tank.