Thanks to Small Engine Surplus, Missouri.

Getting the information you need to make a move on a project like this can be a pain sometimes and you could end up looking like a fool with a shop full of parts, and the grass still growing outside. Fortunately suppliers like Brian of Small Engine Surplus are the help you need, they may not know the definite answer as to whether an engine is 100% suitable, but they provide sound and reliable advice enabling you to make an 'informed' decision on a projects chance of success.

To me its much more satisfying to fix and keep a mower like this running than buying a new one.