I recentlly installed an A112 engine to my 600. I cut of 1cm from the gearbox axle and the engine fitted just fine. I used Fiat 600 flywheel, cluch disk and preasure plate but the engine spins. One possibility is that my cluch disk is not new (but it is not for trash too). I have ordered a new set of cluch disk, preasure plate and bearing to install and I hope that it will make the problem go away.
Any other ideas or sugestions of what to do if the problem is not the cluch disk??