king_arthur1953,

I'm not sure if I'll even need any stand-offs. Ralph machined the prop hub so the distance from the mount to the end of the prop hub is 6 1/16" so I'm thinking that may work. I'll have to do a little more measuring to be sure. I didn't get my prop bolt and washer. I've emailed Ralph to see about sending one. I'm just glad the engine is here .