Post your general FAQs, comments & questions regarding all Ducati engine & transmission restoration here. [Specific engine FAQs should go in the 'BevelHeaven Garage' section.]
Using sealer between the cases is perfectly OK. You will have to re-shim the crank,trans shafts,shift drum and maybe the jackshaft.Or I think Steve sells a gasket set to cover the belt 750.You should still check the crank preload and the shaft clearances no matter which way you go.
Sorry for the delay, been traveling. Got it back together today. Third crank fired right up! I think I need to rebuild the carb now. The idle mixture screw on the left side does nothing. Thanks for the advice!