Kule beans Kev...
I think you'll find, bang for the buck, that Ebok's Victor series will be your best bet HP wise. I do believe Dove makes some "period correct" hi-flow intakes but they are pricey and tend to be problematic (porosity etc). The Tunnel Wedge 2x4 and Barry's twin 750's (like I'm running) would work good for you and give you some period correct race bling too!