Just to point out, the pictures above are from GazFab, the chap who has made the adapter plate.
I have also been thinking about the TC depths. How do you set the depth on a RV8?
In the past ive always "felt" the TC onto the oil pump drive and never had a problem. When you offer up the autobox and engine, the TC must come forward slightly on the splines to bolt up to the flex plate(?)