You realize that you opened up a 5 year old thread. Other than Charlie IDK if anyone else in the thread is still around this forum. I will add that I have considered adding a turbo to the slant that I am building, am on the fence about that.
I remember this guy "army of chuckness" from the slant 6 site some years ago. Haven't seen him over there either.
Reading his 1st few posts here he never really said what his problem was with the combo he originally had built, it sounds like a pretty good build.
He never said if he completed the original build, or drove it with that engine in place or what. I get the impression that as of 2016 it may have been still a pile of parts. I definitely know how that is, my volare has been a pile of parts almost since then, and here it is 5 years after army of chuckness posted in this thread.