Working on my dads 78 Orion 17.5 foot open bow ski boat. It has an omc outdrive on it for a v-8 and we wanted to change the 305 out for a late model 350 chevrolet. We built a motor and now it wont go into the boat. There is an adapter in the center of the flywheel that goes over the shaft in the bellhousing but this wont work on the late model crankshaft. Does anyone know of anybody who has a replacement hub? Do they exist? I assume this is an omc only shaft or I wouldnt be having this problem. Dont know a whole lot about outdrives being a jet guy but hoping someone can help. Thanks for any input.