Chris:

Have fun.

I have gotten to the point of selecting an engine for the power I want, then leaving it stock.

Concerning the stuffing of the case. K&B did it in a similar manner, but instead of filling the ground area they made slots in the web and then shrank an aluminum ring around the outside. Picture shows the "Hot" crank for the Q40 on the left, the standard crank on the right. They can be installed interchangeably.

Bill.