I put a 2 pc .100 thick aluminum spacer between the cylinder heads and the TP rocker boxes. It raises them to allow for the valve protrusion that John Sachs mentioned in his first post. This spacer moves the center line of the roller rocker tip about .060" to the outboard side of the valve stem fixing the geometry problem. I have been running them for 20,000 miles to determine if there were any other problems. The thing that I would consider would be to install lash caps on the valves to bring the push rods back to proper length. I used the existing metal gasket between the head and spacer and then used very thin smear of high temp rtv between the spacer and rocker box. Essentially I glued the spacer and rocker box together. Use the RTV sparingly. You do not want this stuff floating around in the motor. The use of the existing metal gasket allows for the expansion of the jugs. To appreciate the geometry of this hold up two fingers in the peace sign. As you move higher up the v the farther apart your fingers are.
I can't speak about any other wear problems with the TP's or about the use of lash caps if desired. I would expect that John Sachs would chime in on those issues.
Your rocker bolts will not have the same engagement. You will need some of them to be longer.
This is the 1st One Piece Prototype
View attachment 31218
Final Spacer Design
View attachment 31221
Checking the Geometry and Wipe Pattern
View attachment 31219