If you only want a 450hp a little stroker would do it.
If you are set on a turbo a single MP 70 would make more than enough.
If you are looking for around 1k hp an S400 could gety you close.
I hope you have an early 010 casting block with steel center caps.
A short fill would not hurt. This with a good forged bottom end.
Use JGS WG and BOV and get some good siozed injectors.
I would check out the
www.theturboforums.com for more info.