Fastest/ most powerful slant six?

The car made 280 wheel hp naturally aspirated (6800 rpm) and 480 wheel hp with 15 lbs of boost (around 6000 rpm cant recall right now).
I have been pretty busy this year but did get some body work done on the car. Machine work is done on a new "experimental" motor, should get together soon. Also going to get started on a more normal motor in case the "experimental" motor dose not last. If you can call a high rpm slant normal. Sheet metal intake also should be done in the next couple weeks (yes I will post a picture). Hope fully we will make a pass this fall. Thank you guys for the kind words.
Will