gear drive chainsaw

I have ran across a McCulloch 660 few weeks back. I tinkered with to get it running. Shortly after it ran for a little will something wasn’t right. The motor was cracked, took it apart and had a messed up crank bearing and missing a needle in the push rod bearing. What motors out there will fit?

I have this homelite super 1130g that I'm selling. Saw starts and runs great, cuts like a beast. This is a very late version of these saws, has the hand guard and a rim drive sprocket which are not very common on these. Saw comes with the 42" homelite sprocket nose bar with .404 full skip chain...