This engine has a 3/4" diamter shaft. The H70 engine is no longer made. The newer Overhead valve style engines are about 2" wider than the H70 engine toward the right side as you are facing the crankshaft.
Additional Info
Due to this width difference, it will sometimes interfere with the chute control rod especially if your control chute rod is high and close to the engine. If you can adjust your chute control rod to clear the engine, then one of the engines listed here should work for you.