You need an existing rear cam cover, or weld a plate over the hole for the hydraulic drive. If I can remember rightly, the hydraulic drive just bolts to the camshaft drive cog. Yes you will need a flywheel, but it just fits as the original. I put one of these into my F6 in Spain and it runs so sweetly and is so much more economical than my old one, plus it doesn't drip oil. This one was a lot freer than the one I used, which was incredibly stiff when I came to start it. There is just one more left in the barn. The manifold needs changing as does the rocker cover, or re-fashion the carburettor cable mounting. The only real modificationwas to cut a lump off the bottom left hand corner of the crankcase. This was obviously done in the factory for the car/van engines, as one can see a sheered off lump of casting in the bottom corner. No time at all with an angle grinder.