The old Teledyne. Yep, they will do 7 some HP. military de rated the things a bunch. I have a couple of them on 1.5KW generators. Loud but reasonably dependable.
Now the bad part. The float in the carburetor swells in gasohol. Swells until it hangs up on bowl. Resulting in either stuck closed or stuck open. Big Pain in the ...
What to do? replacement floats are unavailable. If you run the engine dry every time, it helps. You can file the leading edge off the float It gets you another week or two of operation before it sticks. Removing the carburetor isn't terribly difficult, the lower nut on the carb is a finger special. Un-clip the governor with a little screwdriver. The ignition is a little "odd". two sets points, two magneto's shielded plugs. Related to old motorcycles... a interesting one to setup...
http://www.saturnsurplus.com/
as for the rest of the splitter... looks like plenty of beef, and plenty of stroke. might be a little low for me...