Jimmy....I didn't know those holes were 3" ! That's good ! I sorta knew you would have thought about that. Your whole project is really interesting to me. I've never worked on a type 4 so I'm paying attention.
I've always thought that VW missed an opportunity to produce a great new motor when they came out with the type 4. I think it was a mediocre improvement on a Type 1 and 3 and could have been better. My comparison is the Suby EJ 25
However, you certainly have demonstrated that a Type 4 can be a monster motor !!
I Salute you.............Bruce