Keven,
Are you looking for an original set up or a conversion kit?
There's an eBay seller,
Alfa1750, in Italy. He occasionally sells original Weber carb setups for around $400. Carbs, intake, linkage, airbox, etc. You'd probably just need a Spica block-off plate.
This would be an alternative to buying the entire kit from IAP or Centerline for $1200! These kits are designed to work with the original Spica intake.
Here's a partial conversion kit (Spica block-off plate lower right):