Fueling & Injection - Sidedraft manifold for LS3

Hey all, Building an Early Corvette GS race clone and want to use LS3 base with Sidedraft Webers or SD Inj. ANYBODY run across a manifold builder/manufacturer that i don't have to start from scratch with. I heard a rumor that it might be available in OZ. Anybody?? Thanks

The Harrop ITB manifold is a crossover style as far as I know.

Thanks Stevie, will check it out