If you're going down the Carburettor route whats wrong with a pair of 45 Webers/Dellorto's? Rather than bodging carbs onto a manifold and they look God awful IMO. Nothing like a pair of Webers at full chat. Cheaper than both Turbocharging and Throttle Bodies. (Unless you can do all the mapping/wiring yourself) and 45's give you just as much gain as Throttle Bodies.