omeone said that there is clutches and transmissions?

I owned an Model 610 ( about 1970) that had the V-4 Wisconsin engine. It had a
series of clutches and several yards of chain. It was high maintenence and if
you can't work on it yourself it will break you.

The smal water cooled motor would probably be an improvment over the V-4
Wisconsin but make sure you set the RPM limits to what the original V-4 had.

Hooking up the engine to Bobcat running gear will be interesting. Using the
automatic tranny from the car motor might increase the versatilty of your
machine but it will take some shade tree engineering to hook it all up.
Good luck,
DL