Nicely done!
Boattailed cases and moon-cut cylinders do make more HP depending on displacement and maximum RPM. Since 1976, most racing engines have seen an 8-10 HP improvement on our engine dyno and I consider it very worthwhile on aluminum-cased competition engines.
I will not boattail a mag case as that helps promote cracking if the engine is run above 7300 RPM. Those things need all the material (stiffness) they can get.
