Cars have been using belts to drive the camshafts for years and as a rule they are good for 60,000 miles before the recommended change out, so I serious doubt there will be any issues with the belt driven cams.
Although it is a very nice piece of work, But an engine of this size most people would have little use for in our hobby. I agree it belongs in an ultralite or small car
I'm not sure how you guys are figuring the CI the best I can come up with is 13.20, I must be doing sumpin wrong???
I notice the flex in the crank as well, some what scary to see but if a person really knew how much flex a standard car or truck crank has they would be afraid to drive it