What goodies do I need to build a Fast slant 6

Steve Dulcich (Roadkill Garage) put together a hot supercharged slant that made around 300hp but that blower kit was 3 grand at least! They ran it N/A once and it made ~220hp at the crank. He ported the head, shaved quite a bit off and put a good cam in it, then topped it with a 4 barrel. So that's about as good as it gets as far as I have seen.

If I ever find a spare slant I'm going to look around at other OHC cylinder heads that might fit...