OK the engine on my 91 Zephyr has blown a 5inch hole through the crank case, can I replace the lump with a Kwak GT750 engine? or maybe a lump from a ZX-7R? the GT750 and KZ750 engines look like they are the same power plant with the same mounting brackets, can anyone confirm this? but the ZX-7R is water cooled will it fit in a Zephyr frame?