Ted, things are just the way you thought. Only problem at the moment is that because of that 6mm thick engine rear plate, we have to use either 6mm spacer with that wilcap spacer or we have to make a new one.
Here is couple of pictures about what was needed to make that starter work.
Wilcap adapter.
This is the view through starter hole at the adapter. Huge bump must be removed from Powerglides bellhousing.
This is how it looks afterwards. I had to grind over 1 inch deep to make that starter gear clear that housing. But, I think that doesn't make it too weak anyhow.
Starter housing interferes with one positioning pin at the adapter, so I had to grind some material off the housing.
From there...
And now it fits, but we have to lower the engine for couple of millimeters because the starter hits the frame tube. Not a good thing....
Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)