It's junk. There is a chip out of the exhaust manifold.

It does look like another would be worth converting. I will hang on to it for a while and see if another jug falls into my junk pile. It would pare down well. The top of the jug needs to be cut off. The bottom of the crankcase needs to be machined. After that aluminum angle stock would make a good beam mount bolted to the side of the case. at that point it woul be very minimalistic. The intake manifold its the more desireable type with a bolt on type. It has two rings. I also like that the con rod is the split type for the crank pin. It is goofie looking as it sits though.

If you have access to a mill this one is probably worth a look.

Yikes! What happened ot the pictures? Scrool through as usual. There are actually several.