Fitting the smaller starter motor as fitted to the 240 to 940 Volvos will give you more room around the MC area. This starter runs a bit quicker too and if needed, much easier to find recon than the B18/20 ones. Needs different bolts to do the swap and an easy job if fitted before you drop the engine in. At least prove the fit before fitting an engine less starter, which you might want to do for access to the MC and clutch mechanisms. Bell housing holes need to be opened out a fraction to take the 12mm bolts needed for these starters. Minimum length 100mm and using a socket/Allen headed bolt for the top one can be useful.