I have everything in the correct order according to the diagram you posted.
*my words "clutch housing" = diagrams's words "clutch drum / #33"
*my words "clutch bell" = diagram's words "drive gear set / #25"
27 is a 'flat on both sides' spacer. The diagram makes it seem a little thicker than it actually is, which is making me paranoid thinking the "spacer" is the wrong piece (thick washer) incorrectly put in there by the previous owner. BUT, i don't think that's the case considering this engine looks like it's never been open. Also, if that's thicker, it will shift the teeth up higher and not line up with the teeth on the main gears.
I'll go re-examine it tonight when I get home from work. Plus, I'll try reaching out to 2 speed owners to see if there is something not as intuitive going on here that is specific to the 2 speeds.