Motor is now on the workbench!
It is going to be very over-square, and should rev higher than most vintage Whizzer motors.
I think, as we discussed, I will use a vintage "bored out" Tillotson carburetor instead of the Mikuni. The Tillotson was removed from a Cushman Eagle motor, bore increased, and has the major advantage of the adjustable main jet.
Have fun,