Thats excellent Eugene!
I thought I recognised his heads from your pic
The measurements he takes with his heads (which you mentioned) do concur with his cataloque writings and website
I remember (yeah, I know..) that Wilke Tuning from germany used to make and advertise split-duration cams. Not sure if they still exist tho. Site hasn't been updated for ages...
http://www.wilke-motorenbau.de/index.htm
But the most available are the split duration/lift cams from webcam and they also make you a custom split-duration/lift at a very small extra cost. You can contact them directly or order a custom one throught aircooled.net.
My turbo engine will use a custom webcam with Thorsten lifters. I have good faith that combo will live a long life, but as always, no guarentees...
Greets,
Walter