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yeah, the engine PTO shaft is shorter on the clutch engines and the Key, at least on mine is narrower. also the seal on the engines PTO shaft is installed backwards because of the higher oil level in the clutch, at least on my engine its done like that.. I to am putting a clutch on a non clutch engine, I to have to drill and tap the holes in the non clutch engines block to accept the clutch housing, no big deal tho when you have a bridgeport mill :-) mock fit the clutch housing over the front main bearing plate to make sure it does not bottom out, i have noticed that some of the non clutch engines have an arrow and *TOP* cast on it, I am not sure if this will interfear, but my junked clutch engine does not have this cast into it... as for the crank, use a clutched engines crank or machine the crank you have to the right length, if you need measurements i can give them to you. also you will need to drill a small hole in the crank for the set screw, because the key on a non clutch engine crank is bigger you may need to buy a special key through a suplier like Mcmaster Carr I hope this helps...
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