The drive looks fine.The prop pulley having no front support would not be a problem I hope.What size prop does the fleet use? I am thinking of using the L13/15 engine because of availability with the stock ignition/fuel system.I need info on the Guibo or the crankshaft flex coupling.Is it a car driveshaft part? Can you provide a part number or car spec. I need to swing a 72 42 prop at approx 2000rpm for an aircamper. Thanks and keep up the good work.