Sounds great!
What flywheel are you using? We used the ARC & also used the ARC Crank weights weights (Briggs) & HD Valve Springs. Seems to work fine.
The only problem we have had so far is the stock Mikuni runs out of fuel. There have been some previous suggestions to drill the jets out........just a little "Skeerd"....the jets are NLA, so if you mess one up, you have to buy a whole new carb.
I would like to try to fit a FC540V 17hp Carb on it but the intake bolts are much larger. I would have to get real creative modifying the intake, and making a filter adaptor.