I have fallen in love with dual carbs for inlines, based on my experiences with FORD inlines. Two Webers sounds good and will look good in my opinion.
The term "3/4 cam" is an acronym from the early years of hot rodding and it should be retired. In today's age of specialized engine componentry your cam choices are many and depend on the type of driving and the car's intended use. Cams have evolved for specific uses such as mileage, towing, RV, pulling, circle track (many types), drag race (many types), marine, turbo, nitrous, etc.
Generally speaking, adding lift and duration raises the engine's operating range, often at the expense of fuel economy, driveability and idle quality.
One more parting factoid to help your decision: The single most important event in terms of where your engine makes power is when the intake valve closes.
