all you should need to convert this engine is a prop adapter. for the engine mount you can just go to the hardware store and get some nylon spacers the length you need, a stick of 10-32 allthread and some nyloc nuts, but this only works if you can get to the back side of the firewall... that style works well though... just go straight out 4 of the 5 back plate screw locations

if you can machine a prop adapter, it's not that complicated, just make the blank the shape you want, tap the smaller end to the threads on the crankshaft (I think it's 5/16 24) then drill and tap the large end for whatever size you want the bolt to attach the prop to be, you have to cut the crank where the threads start to make this work, but you can do that with a hacksaw or dremel or something...