Just to those who don't realise it, there are two engines being talked about here.
The Rolls Royce-Continental O-240 was 130hp and carburetted - found most commonly in Reims-Cessna FRA150Ls and Ms (F = French, R = RR O-240, A = Aerobat). They were also fitted in Rollason Condors.
The IO-240 is a 'modern' injected Continental engine found in the Katanas (Americans didn't accept the Rotax 912 powered examples) and more recently, the IO-240F (125hp) is found in the front of the Liberty XL (F = FADEC).
O-240 cranks are very rare. Best starter mod to get rid of the clutch is the B&C starter - not cheap but reliable and powerful enough to almost get airborne on....