As long as the block and cylinder heads aren’t cracked, and even then it’s possible to repair that, a good machine shop can bore out the cylinders if necessary, and if needed install sleeves and rebuild it to like new condition. They may even have hardened steel replacement valves and seats so it can run on the ethanol laden crapgas. Some engines until the early 50’s like the Plymouth flat 6 used babbitt bearings. If your engine has them and still runs be sure to change the oil if it’s been sitting for so long and use only NON DETERGENT motor oil.
I found the manual online and changed the oil and the filter before starting it. thanks1